Question

if the first and third term of an ap are (a-b)^3 and (a+b)^3 find the second term

Answer 1

let the first term be x and the common difference be d...so..x-(a-b)^3=(a+b)^3-x...so 2x=(a+b)^3+(a-b)^3=>2x=2a^3=>x=a^3=second term(ans)