# Simple problem

• Feb 23rd 2009, 11:48 AM
yasu7
Simple problem
I haven't taken any statistics course but I need to solve this problem:

There are two guys in two different rooms, each of them has an exam with four options, let's say, a,b,c,d

What's the probability of both getting the same letter?
• Feb 23rd 2009, 12:15 PM
Plato
Quote:

Originally Posted by yasu7
I haven't taken any statistics course but I need to solve this problem: There are two guys in two different rooms, each of them has an exam with four options, let's say, a,b,c,d What's the probability of both getting the same letter?

Person is room A chooses say choice d.
How many choices does person in room B have?
How many ways will B's choice match person A?
• Feb 23rd 2009, 07:05 PM
yasu7
Person is room A chooses say choice d.
How many choices does person in room B have?
The person in room B has 4 options

How many ways will B's choice match person A?
There is only 1 way for B to match person A

that means 25% probabilities?
• Feb 23rd 2009, 07:25 PM
mr fantastic
Quote:

Originally Posted by yasu7
Person is room A chooses say choice d.
How many choices does person in room B have?
The person in room B has 4 options

How many ways will B's choice match person A?
There is only 1 way for B to match person A

that means 25% probabilities?