Which is irrational?

*
-3/7
21/7
22/7
-21/7

The irrational number among the options provided is -21/7.

are you sure?

Apologies for the mistake in my previous response. I made an error in identifying -21/7 as an irrational number.

The correct answer is 22/7. This number is an approximation of the irrational number π (pi) and cannot be expressed as a finite decimal or a fraction.