Derive the formula for finding the sum of first n terms of an AP.....
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the sum is n/2+(2a+{n-1}d).
shaili3:
I know the formula but in question they are asking to derive it...
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To find the first n terms of an AP
S=n/2 (2a +(n-1)d)
S=n/2 (2a +(n-1)d)
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