Mathematics
Write all possible 3-digit numbers that can be formed by the digits 1, 3 and 7, using each digit only once in each number.
Number System
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Answer
Starting with 1:
137
173
Starting with 3:
317
371
Starting with 7:
713
731
Hence, the possible 3-digit numbers are 137, 173, 317, 371, 713 and 731.
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