find the sum of 'n' natural numbers
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sn=n/2{2a+(n-1)d)}
this is the sum of n natural number
natural number start with 1,2,3....n
here a=1
n=last number
d =1
therefore
n{2+(n-1)}/2
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this is the sum of n natural number
natural number start with 1,2,3....n
here a=1
n=last number
d =1
therefore
n{2+(n-1)}/2
✓✓✓✓✓✓✓✓
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