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Summer Clouds moderators

24/11/2017 at 13:50
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In a standard set of dominoes, a face of each domino has a line through the center, with 0 to 6 dots on each side of the line. Each possible combination of dots is used exactly once, one combination per domino. What is the probability that a randomly selected domino will have the same number of dots on both sides of the line? Express your answer as a common fraction. 
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    Lê Quốc Trần Anh Coordinator 24/11/2017 at 17:59

    The probability is: \(\dfrac{7}{7+6+5+4+3+2+1}=\dfrac{7}{28}=\dfrac{1}{4}\) 

    (The dominos are: 0-0;1-1;2-2;3-3;4-4;5-5;6-6)

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