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A magazine printed photos of three celebrities along with three photos of the celebrities as babies. The baby pictures did not identify the celebrities. Readers were asked to match each celebrity with the correct baby pictures. What is the probability that a reader guessing at random will match all three correctly? (2014 AMC 8 Problems, Question \#12) 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability->Questions Involving Probability
There are $3 \times 2 \times 1 = 6$ ways assign the pictures to each of the celebrities. There is one favorable outcome where all of them are matched correctly, so the answer is (B) $\frac{1}{6}$. 