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| 1. |
How many three-digit numbers are divisible by 9 |
| Answer» First and last 3 digit no. divisible by 9 are 108 and 999Let a=108,l=999 , d=9 n=?l=a+(n-1)dl=108+(n-1)9999=108+9n-9999-108+9=9n900=9nn=100Therefore 100 three digit numbers are divisible by 9 | |