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27 December, 13:20

The odds of spinning red on a spinner are 2:7. What is the probability of not spinning red?

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  1. 27 December, 16:20
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    5:7.

    To figure this, you just need to read it like the probability of getting a red is 2/7, and therefore any other color on the spinner must be NOT red. You consider the complement, which here would be:

    1 - P (landing on red) = 1 - 2/7 = 5/7

    In general, the complement of a single event is 1 minus the probability of that event occuring.
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