“My neighbor owns his own property” your book said non mathematical, but tell me if it’s supposed to be. I can write you a new one.
Answer:
-45 is xn
The x=3 and x=-15 multiply them together which is the answer to xn
P(no girls in five births) = p(five boys) = (1/2)^5 = 1/32 = 0.0313