The UCSC football team wins any one game with probability p, and loses it with probability 1 − p. Let l₁ be the number of losses before its first win, and let l₂ be the number of losses after its first win and before its second win. Find the joint pmf of l₁ and l₂. What is the joint pmf?
a) P(l₁, l₂) = p(1 - p)²
b) P(l₁, l₂) = p(1 - p)
c) P(l₁, l₂) = p²(1 - p)
d) P(l₁, l₂) = p²
