Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
A necklace is made by stringing N individual beads together [#permalink]
18 Jan 2008, 10:14
0% (00:00) correct
0% (00:00) wrong based on 0 sessions
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 begin with a red bead and ends with a white bead, then N could equal
Re: PS - probability [#permalink]
18 Jan 2008, 11:35
Here's how the necklace looks when it is strung:
We know that the length of the pattern is 5 beads (shown above). The necklace begins at the red bead and then ends in a white bead. The shortest necklace we could have would be RED-GREEN-WHITE, which would only be 3 beads and then fit the bill. The next shortest necklace we could have would be when the pattern of 5 beads has been repeated again. In other words (3+5=8 beads) In this case the pattern would loop once (5 beads), then start RED(6)-GREEN(7)-WHITE(8).
The pattern that emerges here is that the number of beads will be in this list:
3 3+5 = 8 3+5+5 = 13 3+5+5+5 = 18 etc
Any easier way of writing this pattern would be to say that the number of beads must be divisible by 5 with 3 left over. or, when the number is divided by 5 it has a remainder of 3. Then we move onto our choices: