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Series 1^(2) + 2.2^(2) + 3^(2) + 2.4^(2)...

Series `1^(2) + 2.2^(2) + 3^(2) + 2.4^(2)+ 5^(2) + 2.6^(2)`+ ……are given. The sum of its first 20 terms is A and that of first 40 terms is B. If `B- 2A = 100 lamda, " then" lamda=`…….

A

232

B

248

C

464

D

496

Text Solution

Verified by Experts

The correct Answer is:
B
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