Sum of even integer from 100 to 1000
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S=100 +102 +........... 1000
a=100
l=1000
a+(n-1)d=1000
100+(n-1)2=1000
(n-1)2=900
n=451
Sum is given by
S=n/2(a+l)
=451/2(100+1000)
=451/2 X 1100
=248050
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