The Mailing
A mail room employee of a business was asked to send a mailing to a 10% sample of their customers. Rather than randomly selecting the customers, he devised a selection scheme. He picked the first name on the list, skipped one and picked the next one, skipped two and picked the next, and so forth until he came to the end of the list. To his surprise, the last name selected was the last name on the list. Also, upon examination, he found that his system had selected exactly 10% of the names on the customer listing.
How many names were on the mailing list?
How many names were on the mailing list?
posted by Zaux at
8:49 PM
4 Comments:
If pick n letters, that there must have been
1+2+3+4+5+... +n = n(n+1)/2 letters altogether.
So require n = 0.1n(n+1)/2
As n <> 0 get 20 = n + 1 => n = 19.
So the toal number of letters = 190.
yep ... 19 and 190
You wouldn't believe what a mess I made getting that together. 6:30 AM prolly not the best time for thinking.
190...after a hardworking process:D
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