The first 2 digit number divisible by 7 is 14, and the last 2 digit number

divisible by 7 is 98, so it forms AP with common difference 7

14,…,98

98 = 14 + (n – 1) × 7

n = 22

How many 2 – digit numbers are divisible by 7?

How many 2 – digit numbers are divisible by 7?