Question

find the number of all multiple of 7 lying between 109 and 993

Answer 1

126 multiple of 7 lying between 109 and 993.

hope this helps you...

Answer 2

First no. divisible by 7 between 109 and 993,
a = 113,an =987 , d= 7
987=113+(n-1)7
987-113=(n-1)7
874=7n-7
7n=881
n=881/7
n=125.85
n=126
Thanks