1.

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=…….

Answer»

232
248
464
496

Answer :B


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