$\"\"$

(a)

The inequality is $\"\"$ .

Property of natural logarithm: $\"\"$ .

$\"\"$

$\"\"$ .

But the logarithmic function is defined for positve integers, ie $\"\"$ .

$\"\"$ .

The solution of the inequality $\"\"$ is $\"\"$ .

$\"\"$

(b)

The inequality is $\"\"$ .

Take natural logarithm on each side.

$\"\"$ .

Property of natural logarithm: $\"\"$ .

$\"\"$ .

The solution of the inequality $\"\"$ is $\"\"$ .

$\"\"$

(a) The solution of the inequality $\"\"$ is $\"\"$ .

(b) The solution of the inequality $\"\"$ is $\"\"$ .