solve If the sequence a1, a2, a3, … an form an A. P., then a1^2 - a2^2 + a3^2 - … + a2n – 1^2 - a2n^2 =

Dear student

a^2 – b^2 = (a+b)(a-b)

here a-b = d ie common difference which can be taken common

so the summation of the sequence is

( d)(Sn)

Regards