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How many terms of the Ap -6,-11/2,-5,...........are needed to give the sum -25? Explain the double answer

Posted by Manjeet Mitharwal 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Shivay Brahmåñ 6 years, 10 months ago

N=20 and 5 both Solve with the help of sum formulae Sn=n/2{2a+(n-1)d} -50=n/2{2*-6+(n-1)1/2. .. . d=1/2 -100=-25n+n^2+..... n^2-25n+100=0..... n^2-2on-5n+100=0..... n(n-20)-5(n-20)=0 n=20and n=5

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