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Googolplex is a really large number made up of googol and plex. googol is a made up word to mean 10 to the power of 100 or 1 with 100 zeroes after it. Plex is 'plus exponent' which means 'to the power of a positive number'. (the alternative is minex, 'minus exponent' which is 'to the power of a minus number') so googolplex is 10 to the power of a googol, or 1 with a googol zeroes after it.
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