[問題] 給 S.5D 的 Assignment

The following picture is just for fun only...


有關同學（尤其是未領取工作紙的同學），可先預留位置，題目詳見如下：

Q1
In a pond, the number of orange goldfish is 8 more than that of black goldfish. If a goldfish is selected from the pond randomly,　the probability of selecting a black goldfish is seven over eighteen. How many black goldfish are there in the pond?

Q2
A four-digit number is formed by arranging 1, 2, 3 and 5 randomly without repetition. Find the probabilities of the following events.
(a) The thousand digit of the number is 1.
(b) The number is an odd number.

Q3
A number is selected at random from the integers 1 to 40 inclusive. Find the probabilities of getting a multiple of 5 or 9.

Q4
A letter is chosen from the words THIRTY and EIGHT each. Find the PROBABILITY of choosing two vowels.