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b) 21*40=3*7*2*2*2*5
c) 35*36=5*7*2*2*3*3
d) 21²=3*7*3*7
e) 35³=5*7*5*7*5*7
f) 40²*21²=2*2*2*5*2*2*2*5*3*7*3*7