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26 March, 18:52

A box contains 400 black pens and 50 red pens. Jose said the sum of the probability that a randomly selected pen will not be black and the probability that the pen will not be red is 1, P (not black) + P (not red) = 1. Do you agree with him? Complete the explanation to answer the question.

I (disagree/agree) with Jose that the sum of the probability that a randomly selected pen will not be black and the probability that the pen will not be red is 1.

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  1. 26 March, 19:25
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    I agree with Jose that the sum of the probability that a randomly selected pen will not be black and the probability that the pen will not be red is 1.

    Step-by-step explanation:

    If we sum the probability of not black and probability of not red, we will get 1.

    The probability of not black means probability of red i. e 50/450

    The probability of not red means probability of black i. e 400/450.

    When we add the probability, we get 1.

    50/450 + 400/450 = 450/450 = 1

    Invariably, the statement is same as finding probability of black and probability of red; just that the value are interchanged.
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