If a,b and c are all positive integers satisfying a∗b∗c=7...

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PS · Problem Solving

705-805

Algebra

If a,b and c are all positive integers satisfying a∗b∗c=7(a+b+c), what is the smallest possible value of (a+b+c)?

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A

12

B

15

C

18

D

21

E

24

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