1, 6, 15, ?, 45, 66, 91...

1, 6, 15, ?, 45, 66, 91

A

25

B

24

C

28

D

23

लिखित उत्तर

Verified by Experts

The correct Answer is:

C

`1+5=6`
`6+9(5+4)=15`
`15+13(9+4)=28`
`28+17(9+4)=45`
`45+21(17+4)=66`

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