CA Foundation P3 · Chapter 15 · Question 2 of 9
A bag contains 5 red and 7 blue balls. Two balls are drawn at random without replacement. The probability that both are red is:
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 5/33
Explanation
P = ⁵C₂/¹²C₂ = 10/66 = 5/33. Equivalently (5/12) x (4/11) = 20/132 = 5/33. Drawing with replacement would give (5/12)² = 25/144.
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