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Let A be the sum of the first 20 terms and B be the sum of the first 40 terms of the series12+2⋅22+32+2⋅42+52+2⋅62+….If B−2A=100λ, then λ is equal to |
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Answer» Let A be the sum of the first 20 terms and B be the sum of the first 40 terms of the series |
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