What fraction of numbers from 1 to 15 are prime?

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Solution

In 1 to 15 total no will be 15 and we know that prime number is basically those numbers which have only 1 and itself factor.
So, here total number is 15 in which 6 are prime numbers.
∵ (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15) dark numbers are prime numbers.
Hence, the fractions of numbers from 1 to 15 are prime $= \frac{p r i m e n u n b e r b e t w e e n 1 t o 15}{t o t a l n u m b e r} = \frac{6}{15} (d i v i d e b y c o m m o n f a c t o r 3) = \frac{2}{5}$ .

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