2+3+4+...+(n-1)= find the value

1.	2+3+4+...+(n-1)= find the value
Answer» Step-by-step explanation: As I KNOW the formula for ADDING 1,2,3…n is given by n(n+1)/2 Comparing to above formula if we want to calculate sum up to n-1 , using the above formula we GET n-1(n-1+1)/2 That is n(n-1)/2 Thus the required formula is n(n-1)/2

Answer»

Step-by-step explanation:

As I KNOW the formula for ADDING 1,2,3…n is given by n(n+1)/2

Comparing to above formula if we want to calculate sum up to n-1 , using the above formula we GET n-1(n-1+1)/2

That is n(n-1)/2

Thus the required formula is n(n-1)/2

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2+3+4+...+(n-1)= find the value