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Question

If (12t1)+(22t2)+..........+(n2tn)=13[n(n21)], then find the value of max[tntk] where n, k ϵ[2,10) and n>k.

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Solution

12+22+32+42.....nn=1tk=13n(n21)
n(n+1)(2n+1)62n3(n21)=nn=1tk=
n(n+1)2=nn=1tk=
tk is set of first K natural numbers
Max(tntk) if n,k(2,10)
t10t2=8
as t10=10t2=2

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