[計量] JJ
3.The number of numbers that can be formed by the digits 1,2,3,4,3,2,1. the odd digits are at odd places is given by
A) 430
B) 215
C) 93
D) 36
E) 18
Ans: E
4. Column A: Number of ways in which 5 differently coloured beads be strung on a necklace.
Column B: 5!/2
7. A and B are two players of a game. Both of them have same number of coins before the start of the game. If a person looses the game he gives his opponent 1 coin and if he wins he gets 1 coin. At the end A has won 4 games. B has 8 more coins than the number he had at the start of the game.Assuming there is no tie in any of the games. Find the number of games they played.
Ans: 16
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 59.105.92.104
討論串 (同標題文章)
完整討論串 (本文為第 1 之 2 篇)：
計量