Question

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=100x, then x is equal to​

Answer 1

Answer:

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