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In a second grade class containing 12 girls and 11 boys, 2 students are selected at random to give out the math papers. what is the probability that both are girls?

User MJakhongir
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The probability is defined as
(number OfFavourableEvents)/(numberOfEvents In TheSampleSpace).

The number of ways of selecting 2 girls from 12 girls is
C(2,12)=(12!)/(10!2!) =66.The number of ways of selecting 2 student from
12+11=23 students is
C(2,23)=(23!)/(21!2!) =253.

The required probability is
(66)/(253) =(6)/(23) =0.261

User Rimkashox
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