Olympiad Test: Number Series - 1 - Class 7 MCQ

This is a simple division series. Each number is divided by 5.

In this simple subtraction series, each number decreases by 0.4.

This is a simple multiplication series. Each number is 3 times more than the previous number.

This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.

Let's analyze the given number series:
8, 43, 11, 41, __, 39, 17

Looking at the pattern, we see that the numbers alternate between two sequences:

• Odd-positioned terms: 8, 11, __, 17 (positions 1, 3, 5, 7)
• Even-positioned terms: 43, 41, 39 (positions 2, 4, 6)

For the odd-positioned terms, we have:

• 8 → 11 → __ → 17
• The difference between 8 and 11 is +3, and the difference between 11 and 17 is +6.
• So, it seems the difference is increasing by 3 each time, so the missing term in the odd sequence is 14 (11 + 3).

For the even-positioned terms, we have:

• 43 → 41 → 39
• The difference between each term is -2.

Thus, the missing term in the sequence is 14.

So, the correct answer is b) 14.

In this series, 5 is added to the previous number; the number 70 is inserted as every third number.

This is a simple addition series; each number is 3 more than the previous number.

In this series, the letters progress by 1; the numbers decrease by 3.

This is a simple multiplication series. Each number is 2 times greater than the previous number.

This is a simple subtraction series; each number is 4 less than the previous number.