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March 25, 2017

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A combination lock has 10 dials. To
open the lock, you must turn the dial right to the first number, left to
the second number. What is the probability that you choose the correct combination?

  • Algebra - ,

    1/10
    Someone can correct me if I'm wrong, but you have 10 dials, 1/10 chances.

  • Algebra - ,

    assuming the same number can be used on the 2nd turn
    the number of turns = 10*10 = 100
    One of these will be correct

    prob of correct choice = 1/100

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