100+102+104+...+196+198+200
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abe calculator SA kar lo bhai jahil ho be
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a=100
d=102-100=2
Tn=200
a+(n-1) d=200
100+(n-1)×2=200
2n-2=200-100
2n=100+2
n=102/2
n=51
so, Sn=n/2(a+Tn)
=51/2(100+200)
=51/2×300
=51×150
=7650
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