Question

the first and last term of an A. P. are a and l respectively. If S is the sum of all the terms of the A. P. and the common difference is given by:
${l }^{2} \: - {a}^{2} \div k - \: (l + a)$
then find k
Please solve in detail
If u dont get the question and have class X mathematics r.d sharma then open page 9.51 and see ques 10

Answer 1

it is to hard for understanding