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make an A.P i.e:- 2,4,6,8..................200

therefore a=2

d=2

an=200

a+(n-1)d=200

2+(n-1)(2)=200

(n-1)(2)=198

N=100

Sn=100/2+[2+200]

sn=50[202]

sn=10100

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therefore sum of first even natural numbers is 10100

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Q: What is the sum of first 100 even natural numbers are?
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