2201A--practice questions for the midterm.

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Anyone who alreagy got the answers for question 6?I got answer but I do not know if it is right,would like to compare with you.
(a).P{first available and second not available}+P{first not available and second available}=60%60%+40%40%=50%.

(b).P(one available)+P(two available)=50%+60%40%=74%.

Can you tell me if it is right?thanks a lot.
 
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