Factorial Mania!

Number Theory Level 3

If the base 10 10 representation of 40 ! 40! is:

a b c d e f 283247897734345611269596115894272000000000 ‾ \overline{abcdef283247897734345611269596115894272000000000} ,

find the value of a + b + c + d + e + f a+b+c+d+e+f

Solve this without WolframAlpha.


The answer is 29.

Sanchayapol Lewgasamsarn by Sanchayapol Lewgasamsarn , 20, Thailand

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1 solution

someone post the solution. I've no idea without coding or wolframalpha :3

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