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- /% 7+l02—l+\l4+....+84

Answer»

Clearly it is an A.P.

Here, a=7 ,d=7/2 , an=84 , Sn=?

We know that,S = n/2 (a+l)S = 23/2 (7+84)S = (23/2) * 91S = 2093/2= 1046.5

So, the sum of 7+21/2+14+.............+84 is 1046.5

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