Let the sequence `a_1,a_2,a_3, ,a_n` from an A.P. Then the value of `a1 2-a2 2+a3 2-+a2n-1 2-a2n2` is `(2n)/(n-1)(a2n2-a1 2)` (b) `n/(2n-1)(a1 2-a2n2)` `n/(n+1)(a1 2-a2n2)` (d) `n/(n-1)(a1 2+a2n2)`