The three digit numbers divisible by 7 are 105, 112, 119, …., 994.

This forms an AP with first term a = 105

and common difference = d = 7

Last term is 994.

Now, number of terms in this AP are given as:

994 = a + (n - 1)d

⇒ 994 = 105 + (n - 1)7

⇒ 994 - 105 = 7n - 7

⇒ 889 + 7 = 7n

⇒ 896 = 7n

⇒ n = 128

Therefore 994 is the 128^th term in the AP.

∴ There are 128 three - digit natural numbers that are divisible by 7.