There are 40 students in 5A. 30 of them like playing basketball, 20 of them like playing volleyball and 15 of them like playing both. How many of them like playing volleyball but not basketball?

5A有40名學生。他們中有30人喜歡打籃球，有20人喜歡打排球，有15人喜歡兩者。他們當中有多少人喜歡打排球而不喜歡打籃球？

A card is selected randomly from a deck of 52 playing cards. Find the probability that the selected card is a face card or a black card.
從52張紙牌中隨機選擇一張。找出所選的卡是人像牌或黑牌的概率。

Jason and Ivan are playing shooting games simultaneously. The probability that Jason hit the target is 0.3. The probability that Ivan doesn't hit a target is 0.6. Find the probability that both of them hit the target.

Jason和Ivan同時玩射擊遊戲。 Jason射中目標的概率為0.3。Ivan沒有射中目標的概率為0.6。找到他們兩個都射中目標的概率。

There are 10 red balls and 4 blue balls in bag A. 2 balls are drawn one by one without replacement. Find the probability that the two balls taken out are of the same colour.
袋子A中有10個紅色球和4個藍色球。現在一個接一個地取出兩個球並不可重複。找出取出的兩個球顏色相同的概率。

There are 6 cats and 3 dogs in a pet shop. three pets are selected at random. Find the probability that at least 2 dogs are chosen.
寵物店裡有6隻貓和3隻狗。現在隨機選擇三隻寵物，找出至少選擇兩隻狗的概率。

There are 3 men and 4 women in a row. Find the probability that women are at one end and men are at the other end.
一行有3個男人和4個女人。找出女人站於一端而男人站於另一端的概率。

There are 20 girls and 30 boys in 4A while there are 15 girls and 40 boys in 4B. A student is selected. Find the probability that the selected student from 4A given that she is a girl.
4A班有20個女孩和30個男孩，而4B班有15個女孩和40個男孩。現在選出一個學生。已知所選的學生是女孩，找出她是4A班的概率。

Which of the following is not true?

以下哪一項是不正確的？

There are 10 students. Event A and B are complementary events.

Event A: All students pass the test.

Event B: All students fail the test.

現在有10個學生。事件A和B是互補事件。

事件A：所有學生均通過考試。

事件B：所有學生均未通過考試。