Discussion
What is the unit digit of \((1! + 2! + 3! + 4!)\)?
Answer: B
\[ 1 + 2 + 6 + 24 = 33 \]
The unit digit is 3. Only the unit digits of the terms matter: \( 1 + 2 + 6 + 4 = 13 \), ending in 3.
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