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Math Help - Simple problem

  1. #1
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    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?
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  2. #2
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    Quote Originally Posted by yasu7 View Post
    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?
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  3. #3
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    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?
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  4. #4
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    Quote Originally Posted by yasu7 View Post
    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?
    1/4, please!

    Same question: You roll two four-sided dice. What's the probability you get the same number of spots on each ....
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