Question

How many three-digit no. are divisible by 7?

Answer 1

142 three digit number are divisible by 7

Answer 2

First three digit numbers divisible by 7,as 105 and last three digit number which is divisible by 7 is 994.

This is an AP
a = 105
d = 7
an = 994

n th term of an AP

an = a+(n-1) d

994 = 105 +( n-1) 7

994- 105 = 7n -7

889- 7 = 7n

882 = 7n

n. = 882/7

= 126


126 three digit numbers are divisible by 7