Prime divided by Prime..

3 / 2 = 1.5 5 / 2 = 2.5 5 / 3 = 1.6666 7 / 3 = 2.3333 \begin{aligned} 3/2 &=& 1.5 \\ 5/2 &=& 2.5 \\ 5/3 &=& 1.6666\ldots \\ 7/3&=& 2.3333 \ldots \end{aligned}

The above shows all equations of ratios of 2 distinct prime numbers. Is it true that the ratio of 2 distinct prime numbers is never an integer?

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3 solutions

Saksham Jain
Nov 25, 2017

LET US SUPPOSE THAT the ratio of 2 distinct prime numbers is AN INTEGER.THEN IT HAS 1 MORE FACTOR AND THEREFORE CANNOT BE PRIME.

Sumukh Bansal
Nov 25, 2017

Let us suppose that there are two integers x , y x,y such that x y = k \dfrac{x}{y}=k for some natural number k k now we know that x = a y x=ay for some natural number a a but a prime number has two factors 1 1 and the number itself. As x , y x,y are distinct it is not possible for there to be two such primes

Consider two primes, p 1 p_1 and p 2 p_2

For p 1 p 2 \dfrac {p_1}{p_2} to be an integer, p 1 p_1 must be a factor of p 2 . p_2. But this contradicts the fact that p 2 p_2 is a prime.

Hence, p 1 p 2 \dfrac {p_1}{p_2} is never an integer.

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