Saved Bookmarks
| 1. |
Hoe many 3 digit no. Are divisible by 7 |
| Answer» The first three digit number which is divisible by 7 is 105 and last three digit number which is divisible by 7 is 994.This is an A.P. in which a = 105, d = 7 and l = 994.Let the number of terms be n . Then tn = 994.nth term of A.P = tn = a + (n - 1)d.⇒ 994 = 105 + (n -1)7.⇒ 889 = 7(n-1)⇒ n -1 = 127∴ n = 128.∴ There are128 three digit numbers which are divisible by 7. | |