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If S29=99 and S99=29 find S128

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If S29=99 and S99=29 find S128

Posted by Oshin Rastogi 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Oshin Rastogi 6 years, 9 months ago

Tnx but S means sum..... Solve it by taking sum of 99 terms..... ?

0Thank You

Simran Kaur 6 years, 9 months ago

S29= a + 28d . S99= a + 98d .. . .a+28d=99 . a+98d=29 . ==> -70d= - 70 ===> d=1 .. .. a+28d=99 ==>a= 99-28 ==> a= 71... S128=a+127d ==) 71 + 127 ===> 198.......?

2Thank You

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