If p is a prime number, then prove that √p is an irrational number.
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Let p be a rational number and p= a/b
➪p=a^2/b^2
➪a^2=pb^2
➪p divides a^2
But when a prime number divides the product of two numbers, it must divide atleast one of them.
here a^2 =a×a
p divides a
Let a=pk
(pk)^2 =pb^2
➪p^2k^2
➪b^2=pk^2
∴p divides b^2
But b^2=b×b
∴p divides b
Thus, a and b have atleast one common multiple p.
But it arises the contradiction to our assumption that a and b are co-prime.
Thus, our assumption is wrong and p is irrational number.
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