Which of these random variables has a geometric distribution? HELP ASAP

Question

1.the number of attempts before rolling a 3 with a die

2.the number of defective products in a random sample of 20 taken from a production line that has a 3% defect rate

3.the number of diamonds dealt from a deck of cards

4.the number of 0s produced by a random-number generator

Answer 1

For a geometric distribution is the probability of the number x Bernoulli trials to get one success or the probability distribution of the number of failures y=x-1 before you get one success.

For a Bernoulli trial, the result is binary (success - get a 3, or failure - not get a 3), each trial is independent (one roll of the die does not affect the next roll), the success rate is constant (1/6 chance of getting a 3 each time) and you cannot get a 3 and not get a 3 on a single roll of the die.

Answer: the number of attempts before rolling a 3 with a die.