Sum of all even numbers from 1-100
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2,4,6,8,........100
An=100
a=2
n=?
Sn=?
d=2
An=a+(n-1)d
100=2+2n-2
100=2n
n=100/2
n=50
Sn=n/2[2a+(n-1)d]
Sn=50/2[4+49*2]
Sn=25[98+4]
Sn=25*102
Sn=2550
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