Find the sum of all odd numbers upto 100.
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odd numbers =1,3,5,7......99
this is ap with common difference =3-1=2
calculating N0. term
an=a+(n-1)d
99=1+(n-1)(2)
n=50
sum=(n/2)(a+l)
=(25)(1+99)
=2500
this is ap with common difference =3-1=2
calculating N0. term
an=a+(n-1)d
99=1+(n-1)(2)
n=50
sum=(n/2)(a+l)
=(25)(1+99)
=2500
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