1, 7, 3, 9, 6, 12, 10, 16, 15, ?

Solution

Series : 1, 7, 3, 9, 6, 12, 10, 16, 15, ?

There are 2 series at alternate positions, in which consecutive integers starting from 2 are added.

Series are : (1,3,6,10,15) and (7,9,12,16,?)

1st : 1 (+2) = 3 (+3) = 6 (+4) = 10 (+5) = 15

2nd : 7 (+2) = 9 (+3) = 12 (+4) = 16 (+5) = 21

=> Ans - (D)

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