Find the sum of the following APs

+1 vote
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asked Mar 13, 2018 in Mathematics by paayal (26,720 points) 4 6 11
Find the sum of the following APs

(ii) -37, -33, -29, …… to 12 terms

1 Answer

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answered Mar 13, 2018 by sanjaydas (61,430 points) 5 7 7
selected Mar 14, 2018 by faiz
 
Best answer
Solution: Here, a=-37, d=4 and n=12

S=12/2(2x-37+4 x11)=6x-30=-180

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