Home › CA Foundation › Quantitative Aptitude › Binomial Theorem › A bag has 4 white and 6 black balls. Two balls a…
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_
Related questions
In the expansion of a bracket raised to four, the sum of indices is:How many terms are in the expansion of a bracket raised to twelve?How many terms are in the expansion of a bracket raised to five?In the last term of the expansion, the index of b is:In the first term of the expansion, the index of b is:In the first term of the expansion, the index of a is:The general rule for expansion is built using the concept of:Why is Pascal's triangle awkward for a large index?