1.

1, 6, 15, ?, 45, 66A. 25B. 24C. 28D. 23

Answer» Correct Answer - 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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