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The first and last term of an A.P. are a...

The first and last term of an A.P. are a and l respectively. If S be the sum of all the terms of the A.P., them the common difference is

A

`(l^(2)-a^(2))/(s-(l+a))`

B

`(l^(2)-a^(2))/(2s-(1+a))`

C

`(l^(2)+a^(2))/(2s-(1+a))`

D

`(l^(2)+a^(2))/(s-(l-a))`

Text Solution

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The correct Answer is:
B
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