If S29=99 and S99=29 find S128
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Tnx but S means sum….. Solve it by taking sum of 99 terms….. ?
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…….?