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1+2+ .... +n=(n(n+1))/2...

`1+2+ .... +n=(n(n+1))/2`

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Let, `p(n)=1+2+3+...…+n`
Now, `p(1)=1=1/2.(1+1)​=1`
So, p(1) is true
Let, us assume that p(k) is true that is
`1+2+...…+k=(k(k+1))/2` ​ ………(1)
We shall prove that p(k+1) is true
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