1.

The sum upto (2n+1) terms of the series a^(2)-(a+d)^(2)+(a+2d)^(2)-(a+3d)^(2)+… is

Answer»

`a^(2)+3ND^(2)`
`a^(2)+2nad+N(n-1)d^(2)`
`a^(2)+3nad+n(n-1)d^(2)`
`(a+nd)^(2)+n(n+1)d^(2)`

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