(a). we know n/m = P(A)/ 1-P(A)
Cross multiply and we get n- n P(A) = m P ( A)
n= n P (A) + m ( P (A)
n = P (A) ( n +m)
n/n+m = P (A)
(b). Using the above proven relationship,
P (A) = n/n+m = 1/1+13 = 1/14 = .07
(c) again p(A) = 1/1+5 = 1/6= .17
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