Probability 4 Question 10

10. Given that the drawn ball from U2 is white, the probability that head appeared on the coin is

(a) 1723

(b) 1123

(c) 1523

(d) 1223

Passage III

A fair die is tossed repeatedly until a six is obtained. Let X denote the number of tosses required.

(2009)

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Answer:

Correct Answer: 10. (d)

Solution:

  1. P( Head appeared/white from U2)

=P(H)3C15C1×2C12C1+2C15C1×1C12C123/30=1235×1+25×1220/30=1223

Passage III



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