Terence yau asked in 科學及數學數學 · 1 decade ago

maths MC

Eric,Betty,Tracy and Jack sit randomly at a square table. What is the probability that Eric sits opposite to Tracy?

A 1/3

B 1/6

C 1/8

D 1/12

l want clear step...

thx..

3 Answers

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  • 1 decade ago
    Favorite Answer

    Probability for Eric to sits opposite to Tracy

    = 4 X [1/4 X (1/3)]

    = 1/3

    So, the answer is A

    It is because there are 4 choices for Eric to choose a seat.

    Once Eric has chosen a seat, Tracy will have 1/3 chance to choose a seat opposite to Eric.

    Source(s): Myself~~~
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  • 1 decade ago

    Probability for Eric to sits opposite to Tracy

    = 4 X [1/4 X (1/3)]

    = 1/3

    So, the answer is A

    It is because there are 4 choices for Eric to choose a seat.

    Once Eric has chosen a seat, Tracy will have 1/3 chance to choose a seat opposite to Eric.

    Assume that Eric sit in Seat 1, tracy must sit in Seat 3

    so the answer is 1/4*1/3*2*2=1/3

    *2 means they can change the seat and sit in seat2 and seat4

    Source(s): me,me,me
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  • 1 decade ago

    Assume that Eric sit in Seat 1, tracy must sit in Seat 3

    so the answer is 1/4*1/3*2*2=1/3

    *2 means they can change the seat and sit in seat2 and seat4

    Source(s): me
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