March 29, 2017

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Sally has seven blue socks and three white socks in a drawer. She picks out two socks without looking. What is the probability that both socks will be blue?

  • Math - ,

    What is 7/10*6/9 ?

  • Math - ,

    There are choose(10,2) = 45 ways to choose two things from ten if order doesn't matter.

    There are choose(7,2) = 21 ways to choose two blue socks.

    So 21/45 = 7/15

    (This is the same answer as Bob's... do you see why?)

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