SOLUTION: Nine boys and twelve girls have signed up for a trip. Only six students will be selected to go on the trip. Determine the probability that only boys will end up on the trip. Thank

Question 1161251: Nine boys and twelve girls have signed up for a trip. Only six students will be selected to go on the trip. Determine the probability that only boys will end up on the trip.
Thank you in advance for any help:)
I think the answer is : 0.08%
Answer by math_helper(2461) (Show Source): You can put this solution on YOUR website!



9 boys + 12 girls = 21 students total 



P(out of 6 students selected at random, all are boys) = 

    (9/21)(8/20)(7/19)(6/18)(5/17)(4/16) = 60480 / 39070080



     = 1/646 or approximately 0.00155 (0.155%) 

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