Question

You have a set of 10 cards—five red and five blue. Each group of five colored cards is numbered one through five.What is the probability of drawing a red four and then a blue four, while replacing the card between the drawings?

Answer 1

The probability of drawing the Red 4 is 1 in 10. So, the chances of getting it would be 1/10.The probability is also the same for drawing the Blue 4, so it would be 1/10 also.

The probability assignment for this problem is the classical method which means that experimental outcomes are equally likely. So, just multiply the probability of the first event to the second event.
= 1/10 * 1/10 = 1/100
The probability of getting the blue and red four is 1/100 or 0.01.

Answer 2

The answer is 1/100.