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3 x 5 x 7 x 7
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735 = 7*7*3*5
1*2*3*4=24
2)490 5)245 7)49 7)7 = 1 When reduced to '1' Then the four numbers are 2,5,7,7. All prime numbers.
6x4x2
(15,3)(9,5)
7x53=371