please sow how to solve dont just state answer thank you 3 I

please sow how to solve, dont just state answer. thank you

3. In a group of 6 people, 3 have blue eyes and 4 have curly hair. One person has both traits. Let N1 be the number of tests needed to spot blue eyes, and N2 be the number of tests needed to spot curly hair. (a) Find the probability mass function (a grid with p-values in the cells). (b) What is the expected value of N1? (c) What is the expected value of (N1, N2)?