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Which number will replace the question mark (?) in the given figure series?

21, 13, 33, 36, 67, 81, ?, 49, 102


1. 96
2. 64
3. 24
4. 100

1 Answer

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Correct Answer - Option 3 : 24

The pattern followed here is:

Reverse the number then add consecutive integers.

starting from 21

12 + 1 = 13 , reverse it,

31 + 2 = 33,

33 + 3 = 36,

63 + 4 = 67,

76 + 5 = 81,

18 + 6 = 24,

42 + 7 = 49,

94 + 8 =102,

Hence, 24 will be the correct answer.

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