A pigpen contains 7 male pigs and 4 female pigs. Three pigs are randomly drawn

1. A pigpen contains 7 male pigs and 4 female pigs. Three pigs are randomly drawn (w/o replacement).
a. What is the total number of samples (sequences) in which the first and last pigs drawn will be males (the second pig can be male or female).
b. What is the probability that all three pigs drawn will be female?
 


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