Question

30. The probability that Rob wins is 2/7 the probability that Rob loses,what is the probability that Rob loses?

A.2/7
B.5/7
C.9/7
D.7/9
E.2/9
Choice B is wrong.

Answer 1

If P(win) = p, P(lose) = 1-p

p = 2/7 (1-p)

so, p=2/9, 1-p = 7/9