15.
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2•2•5•3•7•11=4,620 
2 x 3 x 5 is the prime factorization of 30.
2 x 5 = 10.
an experiment succeeds twice as many times as it fails. find the chance that in 6 trails, there will be atlest 5 success
3FT [] or [3]ft or 333333333 3 3 3 3 3 feet 3 3 3 333333333