[計量] 請教一題排列組合
<A> There are 5 items in column A and 5 items in column B.
A student is asked to match the columns.
How many possible answers can he give?
<B> There are 6 items in column A and 6 items in column B.
A student is asked to match the columns.
How many possible wrong answers can he give?
答案是B較大 但我怎麼想都覺得兩個是 5!.
麻煩各位幫我看一看...是哪裏想錯了
謝謝喔~~~
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推
01/29 18:00, , 1F
01/29 18:00, 1F
推
01/29 18:13, , 2F
01/29 18:13, 2F
推
01/29 18:22, , 3F
01/29 18:22, 3F
推
01/29 19:38, , 4F
01/29 19:38, 4F
→
01/29 19:38, , 5F
01/29 19:38, 5F
→
01/29 19:38, , 6F
01/29 19:38, 6F
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