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Question
In a class, there are 'z' students. Out of them 'x' are boys. What part of the class is composed of girls ?
Options:
A .  $$\frac{{x}}{{y}}$$
B .  $$\frac{{z}}{{x}}$$
C .  1 - $$\frac{{x}}{{z}}$$
D .  $$\frac{{x}}{{z}}$$ - 1
Answer: Option C

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