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b)12=4*3=2*2*3
c)21=3*7
d)40=4*10=2*2*2*5
e)35=5*7
f)36=6*6=2*3*2*3
9=3*3
b)
12=2*2*3
c)
21=3*7
d)
40=2*2*2*5
e)
35=5*7
f)
36=2*2*3*3