Nine stuffed animals, all different, are placed along a babies toy shelf. How many possible arrangements are there if: a) th
ere are no restrictions. b) Cookie Monster must be in the middle. c) BERT and ERNIE must be together. d) BERT, ERNIE, and OSCAR must be together. e) BERT, ERNIE, and OSCAR must not be together. f) they must not be in alphabetical order.
A) there are no restrictions = 9^9 = 81 b) Cookie Monster must be in the middle = 8^8 = 64 c) <span>BERT and ERNIE must be together = Out of 9, 7 can be rearranged d) </span><span>BERT, ERNIE, and OSCAR must be together = Out of 9, 6 can be rearranged e) UNSURE OF ANSWER E AND F </span>
Random digit dialing<span> (RDD) is a method for selecting people for involvement in telephone statistical surveys by generating telephone numbers at </span>random<span>. </span>Random digit dialing<span> has the advantage that it includes unlisted numbers that would be missed if the numbers were selected from a phone book.</span>
