csat-suneung 2008 Q12

csat-suneung · South-Korea · csat__math-humanities 3 marks Conditional Probability Combinatorial Conditional Probability (Counting-Based)
Bag A contains 5 cards with the numbers $1,2,3,4,5$ written on them, one each, and Bag B contains 5 cards with the numbers $6,7,8,9,10$ written on them, one each. One card is randomly drawn from each of the two bags A and B. When the sum of the two numbers on the drawn cards is odd, what is the probability that the number on the card drawn from Bag A is even? [3 points]
(1) $\frac { 5 } { 13 }$
(2) $\frac { 4 } { 13 }$
(3) $\frac { 3 } { 13 }$
(4) $\frac { 2 } { 13 }$
(5) $\frac { 1 } { 13 }$
Bag A contains 5 cards with the numbers $1,2,3,4,5$ written on them, one each, and Bag B contains 5 cards with the numbers $6,7,8,9,10$ written on them, one each. One card is randomly drawn from each of the two bags A and B. When the sum of the two numbers on the drawn cards is odd, what is the probability that the number on the card drawn from Bag A is even? [3 points]\\
(1) $\frac { 5 } { 13 }$\\
(2) $\frac { 4 } { 13 }$\\
(3) $\frac { 3 } { 13 }$\\
(4) $\frac { 2 } { 13 }$\\
(5) $\frac { 1 } { 13 }$