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72=2*2*2*3*3
630=2*3*3*5*7
1800=2*2*2*3*3*5*5
24 = 2 * 2 * 2 *3
b)8*9 = 72
72 = 2 * 2 * 2 * 3 * 3
c)45*14 = 630
630 = 2 * 3 * 3 * 5* 7
d)12*10*15 = 1800
1800 = 2 * 2 * 2 * 3* 3* 5 * 5