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Given, l=4,d=2 and Sn =-14,find n …

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Given, l=4,d=2 and Sn =-14,find n and a.

Posted by Sanket Arjun 6 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Drip ? Drop? 6 years ago

An=a+(n-1)d=4 Or,a+(n-1)2=4 a+2n-2=4 a+2n=6 a=6-2n Then, Sn=n/2[2a+(n-1)d]=-14

Drip ? Drop? 6 years ago

Hlw

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