Numbered disks are placed in a box and one disk is selected at random. If there are 2 red disks numbered 1through 2, and 6 yellow disks numbered 3 through 8, find the probability of selecting a red disk, given that anodd-numbered disk is selected.
A) $\frac { 1 } { 4 }$
B) $\frac { 3 } { 4 }$
C) $\frac { 1 } { 8 }$
D) $\frac { 3 } { 8 }$

Question

Numbered disks are placed in a box and one disk is selected at random. If there are 2 red disks numbered 1through 2, and 6 yellow disks numbered 3 through 8, find the probability of selecting a red disk, given that anodd-numbered disk is selected. 
A) $\frac { 1 } { 4 }$
B) $\frac { 3 } { 4 }$
C) $\frac { 1 } { 8 }$
D) $\frac { 3 } { 8 }$

Quizplus · Accepted Answer

Given that an odd-numbered disk is selected, we have odd-numbered disks: 1, 3, 5, 7. Among these, only 1 is red. Therefore, the probability of selecting a red disk given an odd-numbered disk is selected is $\frac{1}{4}$.

Numbered Disks Are Placed in a Box and One Disk 14\frac { 1 } { 4 }41​

Numbered Disks Are Placed in a Box and One Disk $\frac { 1 } { 4 }$