WBJEE · Maths · Probability
Ram is visiting a friend. Ram knows that his friend has 2 children and 1 of them is a boy. Assuming that a child is equally likely to be a boy or a girl, then the probability that the other child is a girl, is
- A \(1 / 2\).
- B \(1 / 3\)
- C \(2 / 3\)
- D \(7 / 10\)
Answer & Solution
Correct Answer
(C) \(2 / 3\)
Step-by-step Solution
Detailed explanation
Total sample space \(=\left\{B_{1} B_{2}, B_{1} G_{1}, G_{1} B_{2}\right\}\) Favourable ways \(=\left\{B_{1} G_{1}, G_{1} B_{2}\right\}\) \(\therefore\) Required probability \(=\frac{2}{3}\)
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