combinatorics or probability?

Probability Level pending

A bag contains 60 standard articles and 40 substandard articles. two articles are chosen at random. What is the probability that one of them is standard article while the other one is sub standard article.


The answer is 0.4848.

Piyush Kumar by Piyush Kumar , 21, India

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1 solution

Nabil Ahmad
Jul 5, 2015

60 C 1 × 40 C 1 100 C 2 = 16 33 = 0.4848...... = 0.485 \frac{60C1 \times 40C1}{100C2} = \frac{16}{33} = 0.4848......= \boxed{0.485}

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