Find the sum of the following AP

+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 AP

1/15, 1/12, 1/10, .........11terms

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 = 1/15, d=1/60 and n= 11

S= 11/2(2/15+1/60 x10) =11/2(4+5/30)=11/2 x3/10 =33/20

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