1.

The sum of the first 2n terms of an A.P. is x and the sum of the nextn terms is y, its common difference is :

Answer»

`(X- 2y)/(3N ^(2))`
`(2y-x )/(3n ^(2))`
`(x -2y)/(3n)`
`(2y -x)/(3n)`

Answer :B


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