42 63 84 105 126 147 168 189 210
and so on ...
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3 x 77 7 x 33 11 x 21
Anything in the 20 times table.
It is: 7 times 3 = 21
Since 6 is a multiple of 3, all of the numbers in the 6 times table will be contained in the 3 times table.
21 times.