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29 March, 19:15

An envelope contains small strips of paper of equal size and shape. Four of the strips have the number 4 written on them, five of the strips have the number 5 written on them, and three of the strips have the number 3 written on them. What is the probability of randomly pulling a strip with the number 4 written on it followed by pulling a strip with the number 3 written on it?

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  1. 29 March, 19:25
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    The probability is 1/12

    Step-by-step explanation:

    Mathematically, the probability of pulling pulling a strip with the number 4 written on it followed by pulling a strip with the number 3 written on it = Probability of pulling a strip with the number 4 written on it * Probability of pulling a strip with the number 3 written on it

    The probability of pulling a strip with number 4 written on it = number of strips with number 4 written on it/total number of strips

    Number of strips with number 4 = 4

    Total number of strips = 3 + 4 + 5 = 12

    Thus the probability = 4/12 = 1/3

    The probability of pulling a strip with number 3 written on it = number of strips with number 3 written on it/total number of strips = 3/12 = 1/4

    Thus, the probability of pulling pulling a strip with the number 4 written on it followed by pulling a strip with the number 3 written on it = 1/3 * 1/4 = 1/12
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