Two beads are drawn at random, one after the other, with replacement, from a box containing 5 red and 7 white identical beads. What is the probability that the beads are the same colour
To find the probability that two beads drawn (with replacement) are of the same color, we consider two cases: both red and both white.
Beads = 5, White beads = 7, Total beads = 12
Both Red:
\(P(\text{Red}) = \frac{5}{12}, \quad P(\text{Both Red}) = \frac{5}{12} \times \frac{5}{12} = \frac{25}{144}\)
Both White:
\(P(\text{White}) = \frac{7}{12}, \quad P(\text{Both White}) = \frac{7}{12} \times \frac{7}{12} = \frac{49}{144}\)
Total Probability of Same Color:
\(P(\text{Same Color}) = \frac{25}{144} + \frac{49}{144} = \frac{74}{144} = \frac{37}{72}\)
The probability that the two beads are the same color is \( \frac{37}{72}\).
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