Directions:(1-5) Find the wrong term in the series given below.
1. 21, 77, 211, 391, 697, 1077
Ans: 4 The pattern adds the number to product of a prime number and the number following it: 21 + 7 x 8 = 77 77 + 11 x 12 = 209 209 + 13 x 14 = 391 391 + 17 x 18 = 697 697 + 19 x 20 = 1077
Ans: 3 The pattern is shown below: √140= 11.8 √160= 12.6 √180= 13.4 √200= 14.1 √220= 14.8
Directions:(6-10) Find the wrong term in the series given below.
6. 211, 213, 219, 237, 281, 405
Ans: 4 The next term is obtained by adding the number to the product of its digits. 211 + 2 = 213 213 + 6 = 219 219 + 18 = 237 237 + 42 = 279 279 + 126 = 405
7. 30, 39.0, 50.7, 67.91, 85.683, 111.3879
Ans: 2 The pattern is as follows: 30 x 1.3 = 39.0 39.0 x 1.3 = 50.7 50.7 x 1.3 = 65.91 65.91 x 1.3 = 85.683 85.683 x 1.3 = 111.3879
Ans: 1 From the 3rd number, each successive term is average of previous 2 terms: (76 + 140)/2 = 108 (140 + 108)/2 = 124 (108 + 124)/2 = 116 (124 + 116)/2 = 120
10. 77, 126, 164, 166, 202, 206
Ans: 3 The next term is obtained by adding the number to the square of the last digit of the previous number. 77 + 72 = 126 126 + 62 = 162 162 + 22 = 166 166 + 62 = 202 202 + 22 = 206
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