3,5,7
Number Theory
Level
1
Use only digits 3, 5, 7 without repeating. So, 33 does not count. Form all the possible positive integer that is divisible by 35. The number is at most 3 digits.
35, 75, 375, 735
35, 735
375, 735
35, 375, 735
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1 solution
3 7 5 appearing in three choices but is not divisible by 35 (its reminder is 25), hence, the only choice is 35 and 735)