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There are total 144 pens in that box
20 are defective so
144-20= 124
124 pens are good
Event A
n(S)= 144
n(A)= 124
n(P)= n(A)/n(S)
= 124/144
=31/36
Event B
n(S)=144
n(B)=20
p(A)= n(A)/n(S)
= 20/144
=5/36
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