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22 December, 21:53

A box have 5 beads of the same size, but all are different colors. Tina draws a bead randomly from the box, notes its color, then puts the bead back in the box. she repeats this 3 times. What is the probability that Tina would pick a red bead on the first draw, then a green bead, and finally a red bead again? A. 1/625 B. 1/180 C. 1/150 D. 1/125

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  1. 22 December, 22:37
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    Since Tina replaces the beads after each pick:

    P (R, G, R) = (1/5) (1/5) (1/5) = 1/125
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