Sum of all natural numbers from 1 to 100

Asked by admin @ in Math viewed by 342 People

Find the sum of all natural number from 1 to 100

Answered by admin @


Sn =n/2(2a+(n-1)d)
n=100
a=1
d=1
so S100= 100/2(2(1)+(100-1)1)
= 50(2+99)
=50(101)
=5050

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