Find the sum of all odd numbers from 5 to 205.
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AP=5,7,9.........205
a=5
d=2
an=205
an=5+(n-1)×2
n=101
Sn=101/2(2×5+(101-1)×2)
Sn=101/2(210)
Sn=101×105
Sn=10,605
a=5
d=2
an=205
an=5+(n-1)×2
n=101
Sn=101/2(2×5+(101-1)×2)
Sn=101/2(210)
Sn=101×105
Sn=10,605
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