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A computer password uses 5 letters where no letter may be repeated. How many passwords are possible?
A.26!/5!
B.26!/21!
C.21!/5!
**Weegy:** The answer is A.26!/5!. (More)

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Asked 10/26/2011 12:31:47 PM

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How many ways can a librarian arrange 15 books on a top shelf if she has 20 books from which to pick?
A.20!/5!
B.20!/15!
C.15!/5!
**Weegy:** B.20!/15! (More)

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Asked 10/26/2011 12:39:14 PM

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How many different ways can a president and vice president be selected from a class of 22?
A.484
B.462
C.44
**Weegy:** The answer is B.462. (More)

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Asked 10/26/2011 12:28:29 PM

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A representative from each of seven nations is to sit at a round table to discuss trade relations. How many ways can the representatives be seated?
A.5,040
B.720
C.120
**Weegy:** A.5,040 is the answer. 7 factorial = 5040 (More)

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Asked 10/26/2011 12:29:21 PM

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How many 3 digit numbers can be made if no digit is repeated and the number can not begin with a zero? A.648 B.720 C.900
**Weegy:** The answer is B.720 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ It all depends on how precise you want to be:
Technically, there are:
10*9*8 = 720 non-repeating three digit numbers
Why? Because every time a digit is used, [ it is removed from the choices available for the other two digits.
] (More)

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Asked 10/26/2011 12:42:24 PM

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