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# There are m boys and 12 girls in a class. What is the probability of selecting a...

### Question

There are m boys and 12 girls in a class. What is the probability of selecting at random a girl from the class?

### Options

A) $$\frac{m}{12}$$

B) $$\frac{12}{m}$$

C) $$\frac{12}{m+12}$$

D) $$\frac{12}{m-12}$$

Prob. (a girl) $$=\frac{Number\hspace{1mm} of\hspace{1mm} girls}{Number \hspace{1mm} of \hspace{1mm} boys \hspace{1mm} and \hspace{1mm} girls\hspace{1mm} in \hspace{1mm} class}\\= \frac{12}{m+12}$$
• Prob. (a girl) $$=\frac{Number\hspace{1mm} of\hspace{1mm} girls}{Number \hspace{1mm} of \hspace{1mm} boys \hspace{1mm} and \hspace{1mm} girls\hspace{1mm} in \hspace{1mm} class}\\= \frac{12}{m+12}$$