Probability answer to p (n,d)

A bank has 1 nickel 1 dime and 2 quarters. Pick a coin do not put back pick another coin. Answer to p(n,d)
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The probabilities are as follows: p(1n)=1/4 (0.25)=p(1d); p(1q)=2/4=1/2 (0.5). So p(n or d)=1-p(1q)=p(1n)+p(1d)=1/2.
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