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*3*3*5*7
= 2×9×5×7 or 6×3×5×7
If we use 2,9,7 and 5, total numbers = 4! = 24
If we use 6,3,5 and 7, total numbers = 4! = 24
Total numbers = 24+24 = 48
= 2×9×5×7 or 6×3×5×7
If we use 2,9,7 and 5, total numbers = 4! = 24
If we use 6,3,5 and 7, total numbers = 4! = 24
Total numbers = 24+24 = 48
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