self Maths Puzzle

23 persons[b &g] visits for a movie shooting in a jungle..... after 8 hours of shooting they are still with full enthusiasm. some of them are sitting at benches...
5 black guy and 6 white guy sitting in a bench facing south direction..!!
3 black guy and 8 white guy sitting in a bench in parallel with the previous bench facing towards north....
there is a girl standing in between the two benches.......
what is the probability that the girl will suck a dick and the dick will be black!
ps: all boys and girls are 18+

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self Other Question

1!+2!+3!+....50!= ??? which is the largest num possible by 4 ones??