Question

7th terms of an A.P is 17 and its 17 th term is 7.find 24th term and common difference?what is the sum of 1st 47t terms?what is the sum of 1st 48 terms?

Answer 1

here is your answer just do remember an = a+( n-1)d and
sn =n/2(a+(n-1)d)