Question

The first term and the last term of an
a.P are 6 and 348 respectively . If the common difference is 9 , how many terms are there and what is there sum.

Answer 1

Answer:

A n = a +(n-1)d

348 = 6 + ( n-1) 9

n-1 = 342/9

n = 38 -1

= 37

..............................

Sn = n/2 ( a + l)

=37/2 (354)

= 37×177

= 6549