Grade 12Algebra
sum of product of 1st n natural numbers taken 2 at a time
sum of product of 1st n natural numbers taken 2 at a time
1 Answer
Jayakrishna Natarajan
the expansion of (a1+a2+a3+......an)2.... is equal to a12+a22+.....an2+2*(The required answer)
Therefore [n*(n+1)/2]2 = n*(n+1)*(2n+1)/6 + 2*(The required answer)
Therefore the required answer is [{(n*(n+1))/2}2 - {(n*(n+1)*(2n+1))/6}] whole divided by 2
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algebra
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