csat-suneung 2020 Q7

csat-suneung · South-Korea · csat__math-science 3 marks Combinations & Selection Combinatorial Probability
A bag contains 3 white balls and 4 black balls. When drawing 4 balls simultaneously at random from the bag, what is the probability of drawing 2 white balls and 2 black balls? [3 points]
(1) $\frac { 2 } { 5 }$
(2) $\frac { 16 } { 35 }$
(3) $\frac { 18 } { 35 }$
(4) $\frac { 4 } { 7 }$
(5) $\frac { 22 } { 35 }$ 
A bag contains 3 white balls and 4 black balls. When drawing 4 balls simultaneously at random from the bag, what is the probability of drawing 2 white balls and 2 black balls? [3 points]\\
(1) $\frac { 2 } { 5 }$\\
(2) $\frac { 16 } { 35 }$\\
(3) $\frac { 18 } { 35 }$\\
(4) $\frac { 4 } { 7 }$\\
(5) $\frac { 22 } { 35 }$
Paper Questions
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25 Q26 Q27 Q28 Q29 Q30