Just as numbers can be written in different bases, they can also be written in factorial notation. For example, (34101)_! is 463 in base 10 because
3*5! + 4*4! + 1*3! + 0*2! + 1*1! = 360 + 96+6+1 = 463
If the first place after the decimal point is the 1/2! place, then we would have, for example,
(0.123)_!= 1/2! + 2/3! + 3/4! = 23/24
Write a function to convert a number from factorial notation to decimal notation, or base 10. For digits greater than 9, use A, B, C, etc.
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Last Solution submitted on May 31, 2026

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Chris Cleveland goc3 Dyuman Joshi Christian Schröder

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