✔ 最佳答案
這是一個很普及的數學遊戲:
This is a popular Maths Game:
1.試在心中想一個整數 (1 - 7)。
1. Try to think of an interger within 1 to 7
2.把寫有你心中所想的數的卡紙抽出來。
Then, pull out the cards which contain the number that you've thought of
卡紙1:1 3 5 7
Card No. 1 : 1 3 5 7
卡紙2:2 3 6 7
Card No. 2 : 2 3 6 7
卡紙3:4 5 6 7
Card No. 3: 4 5 6 7
3.如果你只抽出了一張卡紙,那麼你心中所想的數就是卡紙上的第一個數字。
If you only pull out one card, then, the first number would be the number that you've thought of
4.如果你抽出了兩張或三張卡紙,那麼你心中所想的數便是所抽出卡紙上的第一個數字之和了。
If you pull out two to three cards, then, the sum of the first number in these cards would be the number than you've thought of.
這個遊戲運用了二進數的原理。每張卡紙的第一個數字都是 2 的冪。其餘三個數字,是第一個數字與另一張或兩張卡紙的第一個數字之和,即:
This game utilizes the binary number principle. The first number in each cards has a power of 2. For the other three numbers in the card, they are either the sum of the first number in the same card and the first number in another one or two cards, that means:
如果我們心中所想的數字是 5,由於 5 = 1 + 4,所以 5 必定在卡紙 1 和卡紙 3 出現。
If the number that we've thought of is 5, and because 5 - 1+4, therefore, 5 must be appeared in Card no. 1 & 3