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Question

Find :
limn(1222+3242+52+......nterms)n2

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Solution

limn1222+3242+52+...ntermsn2
=limn(1222)+(3242)+(5262)+...ntermsn2
=limn(12)(1+2)+(34)(3+4)+(56)(5+6)+...ntermsn2
=limn(1+2+3+4+5+6+.......nterms)n2
=limnn(n+1)2n2
=limn(n+1)2n
=limn(12+12n)=12+0=12

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