Question

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

Answer 1

Since Tina replaces the beads after each pick:

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