Prove that the following number are irrational first one by under root

1.	Prove that the following number are irrational first one by under root 2
Answer» Assume that 1/root 2 is a rational no.1/root 2 =a/b (a & b are co - prime no. and b is not equal to 0)Root 2a=bRoot 2 =b/aOur assumption is wrong 1/root 2 is an irrational no.

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