Olaitan segun

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The following answers were posted by visitors named Olaitan segun.

Sn=n/2 (2a + n-1)d 820=n/2(2(1)+(n-1)1) 820×2= n(2+(n-1)1) 1640= n(2+n-1) 1640=n(2-1+n) 1640= n(1+n) 1640= n+ n² 1640-n-n²=0 n²+n-1640=0 n²+41n-40n-1640 =0 n(n+41)-40(n+41)=0 n-40 =0 or n+41=0 n=40 or n= -41 That is, 14 terms are needed to make sum of 820