A deck of cards has cards, red cards numbered - and blue cards numbered -
Suppose we shuffle the deck and draw the top two cards. What is the probability that they have the same number?
I would appreciated if you showed me how you did it!!
The probability that the first card has a certain number is 2/20. The probability that the second card has the same number is 1/19. Therefore, the probability that the first two cards have the same number is 2/20×1/19 = 1/190.
The probability of drawing ANY number is 100% or 20 / 20
The probability of the 2nd number matching the first number is: 1 / 19
Therefore, the probability of the cards matching is: 20/20 * 1/19 = 1/19 =~5.26%