Select all irrational numbers. 3/16−−√ 4/16−−√ 9/16−−√ 3/4√ 9/4√

Irrational number: A number is said to be irrational if it can't be written in the form of p/q, q≠0, the decimal expansion is non terminating non repeating.

Also a fraction is rational if it can be written in the form of p/q,q≠0, also it's decimal terminates if it's denominator consists of  .

1. = =Rational number

2. = Rational number

3 . =  Rational number

4.   = As √3 is irrational and 3/4 is rational so product of rational and irrational is irrational.

So, option (4) which is is irrational.