Classroom

Of the 26 pupils in the classroom, 12 boys and 14 girls, four representatives are picked to the odds of being:
a) all the girls
b) three girls and one boy
c) there will be at least two boys

Correct answer:

p1 =  0.067
p2 =  0.2922
p3 =  0.6409

Step-by-step explanation:

p1=26 25 24 2314 13 12 11=115077=0.067
C3(14)=(314)=3!(143)!14!=321141312=364  C1(12)=(112)=1!(121)!12!=112=12  C4(26)=(426)=4!(264)!26!=432126252423=14950  p2=(314) (112)/(426)=364 12/14950=0.2922
p3=1p1p2=10.0670.2922=0.6409



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