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Help Me plz Im stuck Which is the counterexample to the following conjecture? If a number is divisible by 3, it must also be divisible by 9. A.18 B.54 C.21 D.27
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3 votes
Help Me plz Im stuck

Which is the counterexample to the following conjecture?

If a number is divisible by 3, it must also be divisible by 9.

A.18


B.54


C.21


D.27

User Michael Grigsby
by
8.4k points

2 Answers

3 votes
The answer is C.
21 is divisible by 3 but not by 9.
User Adrian Petrescu
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8.2k points
5 votes
21 = 3*7 . . . . . divisible by 3, but not by 9

The appropriate selection is C. 21
User Dmitri
by
8.7k points
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