10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 - 1 = 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
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9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 is 9.999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 x 10^99. It is also written as 10^100-1, since it is 9 followed by 99 nines, (A googol is 1 followed by 100 zeroes) it is a googol minus one.
1 googol = 10100 1 googolplex = 10(googol)
A googol has 100 zeros. A googolplex has a googol of zeros. 1 googol is 10100. A googolplex is 10googol .
1 googolplex = 10googol = ' 1 ' with 1 googol zeros after it.
1 googol is 10100. Or 1 followed by 100 zero's.