engineering intelligence MCQ #82

A bag contains 3 red and 4 black balls. Two balls are drawn at random. What is the probability that both are black?

engineering intelligence MCQ #82

  1. Question 1

    Q1. A bag contains 3 red and 4 black balls. Two balls are drawn at random. What is the probability that both are black?

    • A) 2 / 7
    • B) 3 / 7
    • C) 1 / 7
    • D) 4 / 7

    Answer: 2 / 7

    Explanation: Total balls = 7, ways to draw 2 balls = 7C2 = 21. Ways to draw 2 black balls = 4C2 = 6. Probability = 6 / 21 = 2 / 7.