Question

10. Find the sum of first n natural numbers​

Answer 1

Answer:

sn=n/2(2a+(n-1)d)

Step-by-step explanation:

Answer 2

First n natural numbers are 1,2,3,.....n

here a=1,d=1,nth term= n

therefore Sn=1+2+3+......+n

Sn=n÷2(first term+ last term)

=n÷2(1+n)

= n(n+1)÷2

therefore

sum of first n natural numbers is n(n+1)÷2

Step-by-step explanation:

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