Question

answer proper fast
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Answer 1

Answer:

n(s)=30

p(a)=n(a)/n(s)

n(a)=3,6,9,12,15,18,21,24,27,30=10

10/30=1/3

2)=n(b)=5,10,15,20,25,30=6

6/30=1/5