At first glance, this equation seems simple, but it has sparked debate online:
230 − 220 ÷ 2 = ?
Using the correct order of operations, we divide first: 220 ÷ 2 = 110. Then, 230 − 110 = 120.
But what about the Math PhD who answered 5!? In mathematics, the exclamation mark represents a factorial: 5 × 4 × 3 × 2 × 1 = 120.
So, both answers are correct! One gives the number directly, while the other expresses it using factorial notation. Sometimes, a tiny symbol makes all the difference…
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