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A bag has 4 white and 6 black balls. Two balls are drawn together. Probability both are white is
A2/15
B1/5
C4/25
D1/3
Answer & Solution
Correct answer: A. 2/15
1. Total ways to draw 2 from 10 = C(10, 2) = 45.
2. Favourable = C(4, 2) = 6.
3. P(both white) = 6/45 = 2/15.
4. So probability is 2/15.
_Source: ICAI BoS Foundation Paper 3, Ch 15 'Probability', p.11_
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