1.  It is the same as the probability that all 8 are males.


        P = ,  or, which is the same,  


        P = .


    They are not only "different formulas" - they go with different explanations (=self-explanations),

    but they produce identical results.



2.  P = .


3.  P (at least 6 of the 8 are females) = P(0 males) + P(1 male) + P(2 males) =  +  + .


4.  P (at least 2 of the 8 are males)   = complement to P(at most 1 of the 8 is male) = 1 - P(0 males) + P(1 male) = 1 -  - .