write the formula for the sum of first n natural number
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natural numbers are in AP with d = 1
Sn = n/2 ( 2a + (n-1)d )
where d = 1
Sn = n/2 ( 2a + n -1)
Sn = na + n^2/2 - n /2
a is also one as 1 is the first natural number
Sn = n + n^2/2 -n/2
Sn = n ( 1 + n/2 -1/2)
Step-by-step explanation:
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