1, 4, 3, 16, 6, 36, 10, 64, 15, 100, ?

Solution

Series : 1, 4, 3, 16, 6, 36, 10, 64, 15, 100, ?

The pattern followed is that there are 2 alternate series.

1st : 4, 16, 36, 64, 100 = Squares of consecutive even numbers.

2nd : 1, 3, 6, 10, 15, ? = consecutive integers are added.

1 + 2 = 3

3 + 3 = 6

6 + 4 = 10

10 + 5 = 15

15 + 6 = 21

=> Ans - (A)

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