Question

There is formula for tn in incorrect

Answer 1

a, a+d, a+2d, a+3d, ........, a+(k-1)d,.... And a + (a+d) + (a+2d) + (a+3d) ........ + [a+(k-1)d]+ .... Here T1 = a is the first term and Tn = [a + (n - 1)d] is the nth term of the Series and d is called the common difference.