I'm not sure if I'm right or wrong can someone explain to me what the correct answer is asap?

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Anyone know? will mark brainliest if you're correct!

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?