请教一题 87. A necklace is made by stringing N individual beads together in the repeating pattern red bead, green bead,white bead, blue bead, and yellow bead. if the necklace design begins with a red bead and ends with a white bead,then N could equal
再附上题目 23. The profit from the sale of a certain application increase, though not proportionally, with the number of units sold. Did the profit exceed $4 million on sales of 380,000 units? (1) The profit exceeded $2 million on sales of 200,000 units. (2) The profit exceeded $5 million on sales of 350,000 units.
65. How many integers are there between , but not including , integers r and s? (1) s-r=10 (2)There are 9 integers between , but not including, r+1 and s+1.
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发表于 2009-11-26 13:02:25
