The product of all digits of a 4 digit number is 630. How many such numbers can be made. all the digits of the given number are different
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630 = 2 x 3 x 3 x 5 x 7
There are five digits. Now, let us multiply 3 and 3 as any of the four digits cannot be same.
630= 2 × 9 × 5 × 7
The four digit numbers that can be formed from four unique numbers is the square of square of 4
(4²)²= 16² =256
256 such numbers can be formed.
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