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Find S. (1) S^4=S! (2) S^4!=1

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Director
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Find S. (1) S^4=S! (2) S^4!=1 [#permalink] New post 14 May 2007, 20:01
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A
B
C
D
E

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Find S.

(1) S^4=S!
(2) S^4!=1
Senior Manager
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 [#permalink] New post 14 May 2007, 20:32
(1) is sufficient S^4=S! there is only one solution S=1
(2) is insufficient S^4!=1 is the same as S^24=1 and S can be either 1 or -1

Answer is A
SVP
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 [#permalink] New post 14 May 2007, 22:20
(A)... I agree with Sergey_is_cool :)

Just in stat2, S=0 is also possible as 0! = 1 :)
  [#permalink] 14 May 2007, 22:20
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Find S. (1) S^4=S! (2) S^4!=1

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