Thread: Matching cards.

A petrol station runs a promotion to advertise its new car wash. Each customer is given a pair of cards, each with a letter printed on it. there are a large number of different cards - each one has one of the symbols W, A, $ or H on it. Only 10% of the cards have a $ symbol, and the other three cards are equally likely. If the two cards are both the same the customer wins a prize.
(a) What is the probability that a customer is given a W card and a H card?
(b) What is the probability that a customer wins a prize?

Please help......

There is 30% chance of getting a W and 30% chance of getting a H.

Put together a table of all combinations for recieveing 2 cards, then find the probabilities.

This means there is a 0.09 chance of getting a W and H (.3 x .3)

Originally Posted by hsetima

This means there is a 0.09 chance of getting a W and H (.3 x .3)

I mean in total there is a .18 chance because it can either be W and H or H and W!