Pairs of socks

Ferdinand has twelve pairs of socks, and one sock is leaky. What is the probability of putting on a leaky sock?

Correct answer:

p =  4.1667 %

Step-by-step explanation:

$p=100\cdot {\displaystyle \frac{1\cdot 11}{12\cdot 11}}\mathrm{/}2={\displaystyle \frac{25}{6}}\mathrm{\%}=4.1667\mathrm{\%}$

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