Assumption: The probability that Forson will pass the examination is (3)/(4), as the image cuts off the last fraction.

Here is the solution to your question.

Assumption: The probability that Forson will pass the examination is $\frac{3}{4}$, as the image cuts off the last fraction.

Part 9(a): Probability

Let $P(A)$, $P(I)$, and $P(F)$ be the probabilities that Ayuba, Idris, and Forson pass the examination, respectively.
Given:
$P(A) = \frac{2}{3}$
$P(I) = \frac{5}{8}$
$P(F) = \frac{3}{4}$

The probabilities that they fail are:
$P(A') = 1 - P(A) = 1 - \frac{2}{3} = \frac{1}{3}$
$P(I') = 1 - P(I) = 1 - \frac{5}{8} = \frac{3}{8}$
$P(F') = 1 - P(F) = 1 - \frac{3}{4} = \frac{1}{4}$