Let A be the sum of the first 20 terms a...

Let A be the sum of the first 20 terms and B be the sum of the first 40 terms of the series
`1^(2)+ 2xx2^(2) + 3^(2) +2 xx4^(2) + 5^(2) + 2xx 6^(2)+ cdots ` If B-2A = `100 lambda` then `lambda` is equal to

A

496

B

232

C

248

D

464

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The correct Answer is:

C

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