Because 7 ate 9.
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One. He gives it to six Californians, thereby reducing the problem to an earlier joke...
In earlier work, Wiener [1] has shown that one mathematician can change a light bulb.
If k mathematicians can change a light bulb, and if one more simply watches them do it, then k+1 mathematicians will have changed the light bulb.
Therefore, by induction, for all n in the positive integers, n mathematicians can change a light bulb.
Bibliography:
[1] Wiener, Matthew P., <11485@ucbvax>, Re: YALBJ, 1986
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He was in shock for a week.
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Five. One to screw it in and four to tell him how bitchin' he looked doing it.
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Two — one to change the bulb, and one to write a song about how good the old light bulb was.
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One to petition the Ministry of Light for a bulb, 50 to establish the state production quota, 200 militia to force the factory unions to allow production of the bulb, and one to surreptitiously dial an "800" number to order an American light bulb.
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They had reservations.
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