What fraction of numbers from $2 t o 12$ are composite?

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Solution

Composite numbers from $2 t o 12$ are $4, 6, 8, 9, 10, 12$
So, number of composite numbers from $2 t o 12 = 6$
Total numbers from $2 t o 12 = 11$
Fraction of numbers from $2 t o 12$ are composite = $\frac{N u m b e r o f c o m p o s i t e n u m b e r s f r o m 2 t o 12}{t o t a l n u m b e r s f r o m 2 t o 12} = \frac{6}{11}$
Hence, $\frac{6}{11}$ of numbers from $2 t o 12$ are composite.

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