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Write the formula to find the sum of fir...

Write the formula to find the sum of first n terms of an Arithmetic progression, whose first term is a and the last term is `a_n`.

Text Solution

Verified by Experts

The correct Answer is:
`S_(n)= (n)/(2)( a=a_(n)) ` OR `S_(n) = (n)/(2)+ (n-1) d`
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