Families 2

There are 729 families having 6 children each. The probability of a girl is 1/3 and the probability of a boy is 2/3. Find the the number of families having 2 girls and 4 boys.

Correct result:

n =  240

Solution:

C2(6)=(62)=6!2!(62)!=6521=15  p=(62) (13)2 (23)4=15 (13)2 (23)4=802430.3292  n=729 p=729 0.3292=240



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Showing 2 comments:
#
Math student
The correction notation is p = 6 combination 2 and not 2 combination 6

#
Matematik
Thanks, we just exange 6 and 2

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