Question

find the sum of A.P,s . 1/15 , 1/12 , 1/10 ------------- to 100 terms. ​

Answer 1

Answer:

a= 1/15

d= 1/12 -1/ 15

then 5-4/60 = 1/60

n = 100 S 100 n/2 (2a+n-1)d

equate S 100 = 100/2 (2×1/15 +99×1/16)

20/3+165/1

20+495/3

515/3

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Answer 2

Answer:

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