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Let the sequence a1,a2,a3.........an for...

Let the sequence `a_1`,`a_2`,`a_3`.........`a_n` form an A.P. then `a_1^2`-`a_2^2`+`a_3^2`-`a_4^2`+.....+`a_(2n-1)^2`-`a_(2n)^2` is equal to:- (1)`n/(2n-1)(a_1^2-a_(2n)^2)` (2) `(2n)/(n-1)(a_(2n)^2-a_1^2) ` (3)`n/(n+1)(a_1^2+a_(2n)^2)` (4)none of these

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