1.

A bag contains 4 red and 7 blue balls. What is the probability of drawing a red ball if the first ball drawn is blue? The balls drawn are replaced in the bag.(a) \(\frac {4}{11}\)(b) \(\frac {8}{11}\)(c) \(\frac {4}{18}\)(d) \(\frac {14}{11}\)This question was posed to me during an online interview.I need to ask this question from Multiplication Theorem on Probability in chapter Probability of Mathematics – Class 12

Answer»

Correct choice is (a) \(\frac {4}{11}\)

The EXPLANATION: TOTAL number of BALLS = 4 + 7 = 11

The probability of the first ball to be blue = \(\frac {7}{11}\)

The probability of drawing red ball as the second ball out without replacement = \(\frac {4}{11}\)



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