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No: 03       November 02, 2022


FOUR DIGITS

FOUR DIGITS

How many positive integers are there where only the digits 1, 2, 3 and 4 are used and no digit is used more than the number it represents?

If the problem was asked for the digits 1 and 2 the answer would be 8

1, 2, 12, 21, 22, 122, 212, 221

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