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An urn contains one black ball and one green ball. A second urn contains one white and one green ball. One ball is drawn at random from each urn.
What is the probability that both balls are of same colour?
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What is the probability that both balls are of same colour?
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The correct answer is:
$1 / 4$
Total number of balls in urn $-\mathrm{I}=1$ Black $+1$ Green $=2$ Balls Total number of balls in urn $-\mathrm{II}=1$ White $+1$ Green $=2$ Balls
Required prob $=(1 \mathrm{G})_{\mathrm{I}} \times(1 \mathrm{G})_{\mathrm{II}}=\frac{1}{2} \times \frac{1}{2}=\frac{1}{4}$
Required prob $=(1 \mathrm{G})_{\mathrm{I}} \times(1 \mathrm{G})_{\mathrm{II}}=\frac{1}{2} \times \frac{1}{2}=\frac{1}{4}$
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