Rita Puts 9 Pairs Of Black Socks And 8 Pairs Of White Socks In A Draw

1.	Rita Puts 9 Pairs Of Black Socks And 8 Pairs Of White Socks In A Drawer. She Takes 3 Socks. What Is The Probability That We Get A Pair Of Black Socks?
Answer» among 3 socks she has to CHOOSE 2 black socks from 9 pair(=18) of black socks, that can be done in 18C2 WAYS. and the third SOCK can be chosen from among the REMAINING socks that can be done in ((8+9-1)x2 )C 1 ways i.e. in 32 ways. ans. 32 X 18C2. among 3 socks she has to choose 2 black socks from 9 pair(=18) of black socks, that can be done in 18C2 ways. and the third sock can be chosen from among the remaining socks that can be done in ((8+9-1)x2 )C 1 ways i.e. in 32 ways. ans. 32 X 18C2.

Rita Puts 9 Pairs Of Black Socks And 8 Pairs Of White Socks In A Drawer. She Takes 3 Socks. What Is The Probability That We Get A Pair Of Black Socks?

Answer»

among 3 socks she has to CHOOSE 2 black socks from 9 pair(=18) of black socks, that can be done in 18C2 WAYS. and the third SOCK can be chosen from among the REMAINING socks that can be done in ((8+9-1)x2 )C 1 ways i.e. in 32 ways.

ans. 32 X 18C2.

among 3 socks she has to choose 2 black socks from 9 pair(=18) of black socks, that can be done in 18C2 ways. and the third sock can be chosen from among the remaining socks that can be done in ((8+9-1)x2 )C 1 ways i.e. in 32 ways.

ans. 32 X 18C2.

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