Write down any three-digit number (for example, 425). Examine why they work ?
Make a six-digit number by repeating these digits in the same order (425425). Your new number is divisible by 7, 11, and 13.

How many three-digit numbers are divisible by 7?

Find the sum of all three-digit natural numbers, which are divisible by 7.

How many three digit natural numbers are divisible by 4?

The total number of 5 digit numbers formed using the digits 2, 4, 6, 7, 8 if the digits are no repeated is

The consecutive digits of a three digit number are in G.P. If middle digit is increased by 2, then they form an A.P. If 792 is subtracted from this, then we get the number constituting of same three digits but in reverse order. Then number is divisible by a. 7 b. 49 c. 19 d. none of these

How many 6-digit numbers can be formed from the digits 0, 1, 3, 5, 7 and 9 which are divisible by 10 and no digit is repeated?