1.

1, 5, 21, 57, 121, ?A. 150B. 176C. 200D. 221

Answer» Correct Answer - D
`1+(2)^2=5`
`5+(4)^2=21`
`21+(6)^2=57`
`57+(8)^2=121`
`121+(10)^2=221`


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