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+2.2^2+3^2+2.4^2+5^2+2.6^2+...` If `B-2A=100lambda` then `lambda` is equal to
(1) 232
(2) 248
(3) 464
(4) 496

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