To show that the sum of the first n natural number is n(n+1)÷2 i,e, 1+2+3......+n equal to n(n+1)÷2

To show that the sum of the first n natural number is n(n+1)÷2 i,e, 1

1.	To show that the sum of the first n natural number is n(n+1)÷2 i,e, 1+2+3......+n equal to n(n+1)÷2
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