Question 31

How many 3-digit number can be formed using the 4th, 7th and 9th digits of the number 937862541 each of which is completely divisible by 7?

Solution

1, 5 and 8 are the required digits.

The 3-digit numbers formed by these are 158, 185, 518, 581, 815 and 851.

Of these, only 518 and 581 are divisible by 7. Therefore answer is 2.

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