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How to solve prime factorization of 180 & 420?

Sagot :

they are both divisible by 60
for 180 
 3x60 bring down 3 then factor 60 6x10 then factored out it again 2x3 and 2x5
so that, 3x2x3x2x5is = 180
for 420
7x60 trhen do the same procedure