# 6.(i)    Check the validity of the statement given below by the method given against it   (i) p: The sum of an irrational number and a rational number is irrational (by contradiction method).

Assume that the given statement p is false.

The statement becomes: The sum of an irrational number and a rational number is rational.

Let  $\sqrt p + \frac{s}{t} = \frac{q}{r}$

Where $\sqrt p$ is irrational number and $\frac{q}{r}$ and $\frac{s}{t}$ are rational numbers.

$\therefore \frac{q}{r} - \frac{s}{t}$ is a rational number and $\sqrt p$ is an irrational number, which is not possible.

Hence our assumption is wrong.

Thus, the given statement p is true.

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