Question 609974
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Hi, 
An aviary contained 12 birdies and 15 eagles. {{{27}}} BIRDS in all.
seven of them flew out.
P(4 birdies and 3 eagles escaped through the window in alternating order)
P = {{{(12/27)(15/26)(11/25)(14/24)(10/23)(13/22)(9/21)}}}