find the sum of each arithmetic series of 38+35+32+........+2
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here a=38 ,d=-3 so using
an=a+(n-1)d
we get, n=13
then using
sn=n/2{2a+(n-1)d}
we get sn=260
an=a+(n-1)d
we get, n=13
then using
sn=n/2{2a+(n-1)d}
we get sn=260
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