Question

$sum \: of \: the \: series \: s = 1 + 1 \2 \times 1 + 2 + 1 \div 3 \times 1 + 2 + 3 + 1 \div 4 \times 1 + 2 + 3 + 4 + .......upto \: 20terms \: is$
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Answer 1

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Answer 2

Answer:

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