Boys and girls

There are eight boys and nine girls in the class. There were six children on the trip from this class. What is the probability that:

a) only boys went on the field trip
b) just 2 boys went on the field trip

Correct answer:

p1 =  0.2262 %
p2 =  28.5068 %

Step-by-step explanation:

C6(17)=(617)=6!(176)!17!=654321171615141312=12376 C6(8)=(68)=6!(86)!8!=2187=28  p1=100 (68+9)(68)=100 (68+9)28=22150%=0.2262%
C4(9)=(49)=4!(94)!9!=43219876=126 C2(8)=(28)=2!(82)!8!=2187=28  p2=100 (68+9)(28) (629)=100 (68+9)28 (629)=2216300%=28.5068%

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