Eric Nicholas K's answer to Han Zhi Yuan's Secondary 4 A Maths Singapore question.
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If you have not already known it yet, the explanation mark ! (called the factorial sign) is not a symbol of exclamation, but rather the product of all integers from 1 to a given value. n! (pronounced n factorial) is the product of all integers from 1 to n.
Date Posted:
4 years ago
Thanks for the solution and help! I understood it so clearly xD
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