Write a sum using summation notation of 14+16+18+20+22....+100
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a=14 d=2 first we find an by taking an=100 and then Sn by us8ng formulae Sn=n/2(a+an)
maya8888:
n=Xn-X1
n=Xn-X1 -----------
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Sum of the A.S is 2508
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