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Olympiad Test: Odd One Out - 1 - Class 7 MCQ


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20 Questions MCQ Test Mathematics Olympiad Class 7 - Olympiad Test: Odd One Out - 1

Olympiad Test: Odd One Out - 1 for Class 7 2024 is part of Mathematics Olympiad Class 7 preparation. The Olympiad Test: Odd One Out - 1 questions and answers have been prepared according to the Class 7 exam syllabus.The Olympiad Test: Odd One Out - 1 MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Odd One Out - 1 below.
Solutions of Olympiad Test: Odd One Out - 1 questions in English are available as part of our Mathematics Olympiad Class 7 for Class 7 & Olympiad Test: Odd One Out - 1 solutions in Hindi for Mathematics Olympiad Class 7 course. Download more important topics, notes, lectures and mock test series for Class 7 Exam by signing up for free. Attempt Olympiad Test: Odd One Out - 1 | 20 questions in 40 minutes | Mock test for Class 7 preparation | Free important questions MCQ to study Mathematics Olympiad Class 7 for Class 7 Exam | Download free PDF with solutions
Olympiad Test: Odd One Out - 1 - Question 1

Direction: Find the odd man out.
3, 5, 7, 12, 17, 19

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 1

Each of the numbers is a prime number except 12.

Olympiad Test: Odd One Out - 1 - Question 2

Direction: Find the odd man out.
41, 43, 47, 53, 61, 71, 73, 81

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 2

Each of the numbers except 81 is a prime number.

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Olympiad Test: Odd One Out - 1 - Question 3

Direction: Find the odd man out.
835, 734, 642, 751, 853, 981, 532

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 3

In each number except 751, the difference of third and first digit is the middle one.

Olympiad Test: Odd One Out - 1 - Question 4

Direction: Find the odd man out.
331, 482, 551, 263, 383, 362, 284

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 4

In each number except 383, the product of first and third digits is the middle one.

Olympiad Test: Odd One Out - 1 - Question 5

Direction: Find the odd man out.
16, 25, 36, 72, 144, 196, 225

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 5

Each of the numbers except 72 is a perfect square.

Olympiad Test: Odd One Out - 1 - Question 6

Direction: Find the odd man out.
2, 5, 10, 17, 26, 37, 50, 64

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 6

(1 × 1) + 1, (2 × 2) + 1, (3 × 3) +1, (4 × 4) + 1, 
(5 × 5) + 1, (6 × 6) + 1, (7 × 7) + 1, (8 × 8) + 1
But, 64 is out of pattern.

Olympiad Test: Odd One Out - 1 - Question 7

Direction: Find the odd man out.
582, 605, 588, 611, 634, 617, 600

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 7

Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.

Olympiad Test: Odd One Out - 1 - Question 8

Direction: Find the odd man out.
56, 72, 90, 110, 132, 150

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 8

The numbers are 7 × 8, 8 × 9, 9 × 10, 10 × 11, 11 × 12, 12 × 13.
So, 150 is wrong.

Olympiad Test: Odd One Out - 1 - Question 9

Direction: Find the odd man out.
36, 54, 18, 27, 9, 18.5, 4.5

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 9

The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 do not satisfy it.

Olympiad Test: Odd One Out - 1 - Question 10

Direction: Find the odd man out.
6, 13, 18, 25, 30, 37, 40

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 10

The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.
So, 40 is wrong.

Olympiad Test: Odd One Out - 1 - Question 11

Direction: Find the odd man out.
46080, 3840, 384, 48, 24, 2, 1

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 11

The terms are successively divided by 12, 10, 8, 6, ...etc.
So, 24 is wrong, it should be 8 (48/6 = 8).

Olympiad Test: Odd One Out - 1 - Question 12

Direction: Find the odd man out.
7, 8, 18, 57, 228, 1165, 6996

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 12

Let the given numbers be A, B, C, D, E, F, G.
Then, A, A × 1 + 1, B × 2 + 2, C × 3 + 3, D × 4 + 4, E × 5 + 5, F × 6 + 6 are the required numbers.
Clearly, 228 is wrong.

Olympiad Test: Odd One Out - 1 - Question 13

Direction: Find the odd man out.
190, 166, 145, 128, 112, 100, 91

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 13

Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number. 190 – 24 = 166
166 – 21 = 145
145 - 18 = 127 [Here, 128 is placed instead of 127] 127 – 15 = 112
112 – 12 = 100 ... and so on.
Therefore, 128 is wrong.

Olympiad Test: Odd One Out - 1 - Question 14

Direction: Find the odd man out.
445, 221, 109, 46, 25, 11, 4

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 14

Go on subtracting 3 and dividing the result by 2 to obtain the next number.
Clearly, 46 is wrong.

Olympiad Test: Odd One Out - 1 - Question 15

Direction: Find the odd man out.
196, 169, 144, 121, 100, 80, 64

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 15

Numbers must be (14)2, (13)2, (12)2, (11)2, (10)2, (9)2, (8)2.
So, 80 is wrong.

Olympiad Test: Odd One Out - 1 - Question 16

Direction: Find the odd man out.
3, 7, 15, 27, 63, 127, 255

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 16

Go on multiplying the number by 2 and adding 1 to it to get the next number.
So, 27 is wrong.

Olympiad Test: Odd One Out - 1 - Question 17

Direction: Find the odd man out.
2880, 480, 92, 24, 8, 4, 4

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 17

Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number.
Clearly, 92 is wrong.

Olympiad Test: Odd One Out - 1 - Question 18

Direction: Find the odd man out.
10, 26, 74, 218, 654, 1946, 5834

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 18

2nd term = (1st term) × 3 – 4 = 10 × 3 – 4 = 26 
3rd term = (2nd term) × 3 – 4 = 26 × 3 – 4 = 74 
4th term = (3th term) × 3 – 4 = 74 × 3 – 4 = 218
5th term = (4th term) ×3 – 4 = 218 × 3 – 4 = 650.
5th term must be 650 instead of 654.

Olympiad Test: Odd One Out - 1 - Question 19

Direction: Find the odd man out.
15, 16, 34, 105, 424, 2124, 12576

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 19

2nd term = (1st term) × 1 + 1 = 15 × 1 + 1 = 16 
3rd term = (2nd term) × 2 + 2 = 16 × 2 + 2 = 34 
4th term = (3th term) × 3 + 3 = 34 × 3 + 3 = 105.
5th term = (4th term) × 4 + 4 = 105 × 4 + 4 = 424 
6th term = (5th term) × 5 + 5 = 424 × 5 + 5 = 2125

Olympiad Test: Odd One Out - 1 - Question 20

Direction: Find the odd man out.
64, 71, 80, 91, 104, 119, 135, 155

Detailed Solution for Olympiad Test: Odd One Out - 1 - Question 20

Go on adding 7, 9, 11, 13, 15, 17, 19 respectively to obtain the next number.
So, 135 is wrong.

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