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30 September, 22:55

Any number that is divisible by 3 is also divisible by 6.

Find a counterexample to show that the conjecture is false.

21

18

24

12

+2
Answers (2)
  1. 1 October, 02:22
    0
    21/3=7

    but

    21/6=3.5

    ...
  2. 1 October, 02:47
    0
    21/3 = 7 21/6 = 3.5

    18/3 = 6 18/6 = 3

    24/3 = 8 24/6 = 4

    12/3 = 4 12/6 = 2

    Each can be divided to obtain an integer, except:

    21/6 = 3.5

    So, while 21 can be divided by 3, it cannot be divided by 6 (for an integer anyway)
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