SSC CGL 2012 Tier 1 1 July NZ Evening V

Question 106

The odd element in the sequence 3, 7, 13, 21, 33, 43, 57, is :

Solution

here the given sequence is 3, 7, 13, 21, 33, 43, 57

7 - 3 = 4

13 - 7 = 6

21 - 13 = 8

33 - 21 = 12

43 - 33 = 10

57 - 43 = 14

here we can see that difference between consecutive terms is increasing by 2 every time but due to presence of 33 the pattern is not getting formed and hence 31 is the right number in place of 33 and hence odd one out is 33

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