Card CVV Number Validation Randomly between 2 digits only in java

How to validate the customer CVV number only 2 digits randomly between 3 actual number? Eg: CVV number is 123, i ask customer to provide only 2 digits. it can be 1st and 2nd digit, or 1st and 3rd etc.

I should use some random number generation logic in java. Please suggest me options i can use. Thanks in advance.