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Explanation: 2 X 2 X 2 X 3 X 3 X 5 X 7

Three 2's are needed to cover the 8, which also covers the 4.

Two 3's are needed to cover the 9.

5 and 7 are prime numbers, so they are needed.

6 is covered by a 2 and a 3.

10 is covered by 2 and 5.

12 is covered by two 2's and a 3.

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13y ago

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