Question

訪客

3;4

Answer 1

訪客

3.(全部)—(經C)=C(11,4)—C(4,1)C(7,3)=330—140=190
4.(全部)—(奇數)=C(9,3)—C(5,3)=74

Answer 2

嗚嗚

3應該是這樣

嗚嗚

4下面那個

Answer 3

鯨魚🐳

第三題答案是B
第四題，我不會😅