Series Questions for CAT with Answers PDF

In this series, addition and subtraction take place alternately. Successive multiples of 3 are being added, and successive multiples of 2 are being subtracted.
9 + 3 = 12
12 - 2 = 10
10 + 6 = 16
16 - 4 = 12
12 + 9 = 21
21 - 6 = 15
15 + 12 = 27
Thus, the missing number is 16.

The number series follows the rule as mentioned below:

Hence, 29 is the wrong number.

The series follows the pattern:
450 - (2 × 50) = 350
350 - (3 × 40) = 230
230 - (4 × 30) = 110
110 - (5 × 20) = 10
10 - (6 × 10) = -50
Thus, the missing number is 110.

Given series follows the pattern as mentioned below.
7 + 18 = 25
25 + 20 = 45
45 + 22 = 67
67 + 24 = 91
91 + 26 = 117

Given numbers follow this pattern.
325 - 9 = 316
316 - 18 = 298
298 - 27 = 271
271 - 36 = 235
235 - 45 = 190

The pattern followed is that the numbers are initially being multiplied by 4 and then, the product is subtracted by 2 to get the following numbers by following the same pattern.
(4 × 4) - 2 = 14
(14 × 4) - 2 = 54 
(54 × 4) - 2 = 214
(214 × 4) - 2 = 854
(854 × 4) - 2 = 3414
Thus, missing term is 54.

In the following series, the multiples of 4 are added at odd places and multiples of 3 are subtracted at even places.
85 + 4 = 89
89 - 3 = 86
86 + 8 = 94
94 - 6 = 88
88 + 12 = 100
100 - 9 = 91
91 + 16 = 107
107 - 12 = 95
Thus, missing term is 88.

The pattern is as follows.
233 - 1³ = 233 - 1 = 232,
232 - 2³ = 232 - 8 = 224,
224 - 3³ = 224 - 27 = 197,
197 - 4³ = 197 - 64 = 133,
133 - 5³ = 133 - 125 = 8 
Therefore, missing term is 8.

The series follows the following pattern. 
16 + 8 = 24
24 + 7 = 31
31 + 6 = 37
37 + 5 = 42
42 + 4 = 46
46 + 3 = 49
The missing number is 31.

The pattern here is as follows.
(1)² + 3 = 4
(2)² + 3 = 7
(3)² + 3 = 12 (Answer) 
(4)² + 3 = 19
(5)² + 3 = 28
(6)² + 3 = 39
So, missing number is 12.

The series is baa/bba/baa/bba/baa/bba. Thus, the pattern 'baa/bba' is repeated.

In this series, each number is repeated, then 26 is subtracted to arrive at the next number.
i.e. 106 - 26 = 80
80 - 26 = 54
Therefore,
? = 54 - 26 = 28
This is the correct answer.

42, 57, 87, 132, 192, ?
From the given sequence, we notice that
42 + 15 = 57
57 + 30 = 87
87 + 45 = 132
132 + 60 = 192
192 + 75 = 267

The series is abc/bca/cab/abc/bca. Thus, the letters change places in a cyclic order.

The pattern is: 
11.6 = 2 × 3 + 5.6
39.8 = 11.6 × 4 - 6.6
206.6 = 39.8 × 5 + 7.6 
1231 = 206.6 × 6 - 8.6
8626.6 = 1231 × 7 + 9.6
So, 8407.4 is the incorrect term.