og12的两道书序题~请赐教~~~~~

小娟子nana · 发表于 2010-3-6 14:21:27

og12——98
Seven different numbers are selected from the integers 1 to 100, and each number is divided by 7. What is the sum of the remainders?

(1) The range of the seven remainders is 6.
(2) The seven numbers selected are consecutive integers.

答案是b。有谁会解答这题吗？看了og后面的解释，也不太明白阿。题目中，既然挑选出来的7个数，每个数都可以被7整除，为什么还要求余数呢？明明是“is divided by 7”了。另外（1）是什么意思阿，看不明白。请赐教~谢谢

og12-99

r	s	t
u	v	w
x	y	z

Each of the letters in the table above represents one of the numbers 1, 2, or 3, and each of these numbers occurs exactly once in each row and exactly once in each column. What is the value of r ?
(1)
v + z = 6(2)s + t + u + x = 6

答案是d。og 的解释我是看明白了，但是不明白“row/column convention”这个是什么东西来的？

jessicaddq · 发表于 2010-3-6 14:48:07

第一题题目是说任意挑出来七个数除以七你对“is divided by 7”理解错了并不是能除得尽7
条件2是说挑出来的数是连续的这样余数必定是 0 1 2 3 4 5 6

jessicaddq · 发表于 2010-3-6 14:50:34

不好意思没看清你问的
（1）应该是余数最大和最小相差6 等于是废话

og12的两道书序题~请赐教~~~~~

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