2.3+3.4+4.5+...+upto n terms =n(n
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n(n+1)/2
It's the same as finding the sum of n numbers
For example 1+2+3+4
n(n+1)/2
=4(5)/2
=20/2=10
It's the same as finding the sum of n numbers
For example 1+2+3+4
n(n+1)/2
=4(5)/2
=20/2=10
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