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Show that 12n cannot end with the digit 0 or 5 for any natural number n.

Mathematics - Exemplar Problems

Chapter _Real Numbers
I think it can : 12*5=60 ending with 0



12n can only end with digits 0 or 5 when it base prime factors include 2 and 5 as its factors.

but 12 has not 2 and 5 as its prime factors . so it is impossible for 12n to end with the digit 0 or 5

0 0 0
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