Q6 of 102 Page 429

How many terms are there in the AP 13, 16, 19, …., 43?

To find: number of terms in AP

Also

d = 16 – 13

d = 3

Also

43 = 13 + n × 3 – 3

n = 11

Find three arithmetic means between 6 and - 6.

The 9^th term of an AP is 0. Prove that its 29^th term is double the 19^th term.

Find the 8^th term from the end of the AP 7, 9, 11, …., 201.

How many 2 - digit numbers are divisible by 7?