Statistics
posted by Maryan on .
There are 6 cards numbered from 1 to 6. They are placed into a box, and then one is drawn and put back and then another card is drawn and put back. what is the probability that one of the cards was 5 if the sum of the two was 8?

This is the probability of drawing a 5 and a 3.
P(5) = 1/6
P(3) = 1/6
The probability of both/all events occurring is found by multiplying the individual events.