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If ∑20r=1(r)=a,∑20r=1(r2)=b then the sum of products of 1,2,3,…20 taking two at a time is |
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Answer» If ∑20r=1(r)=a,∑20r=1(r2)=b then the sum of products of 1,2,3,…20 taking two at a time is |
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