Question 1193771
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In all cases, the probability is a fraction, whose denominator is the full number of nails in the bin.


In each case, the numerator of this fraction is the number of nails in the bin satisfying given description.


This hint is enough for you to complete the rest on your own.


For example, in case (a), the answer is  {{{451/(651+243+41+451+333)}}}.

Make calculations and reduce the fraction if applicable.
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And so on . . . Do other cases similarly . . . 



Notice that the denominator is the same in all 3 cases: so, it should be calculated only once.



Happy calculations &nbsp;(&nbsp;!&nbsp;)