Clue to puzzle #19: 100 Factorial
The trick to this is working out what, when multiplied together, will result in the creation of a zero. For example if i were to ask how many zeros were on the end of 3 x 7 x 9 x 8 you know there are no zeros. But what about 3 x 7 x 9 x 8 x 5 ?
The same technique can be applied in all bases.
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