10!=10\*9\*8\*7\*6\*5\*4\*3\*2\*1
10!=10\*9\*8\*7\*6\*5\*4\*3\*2\*1
10! means ten factorial. So 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1.
It’s a common math joke.
A number followed by an exclamation point means multiplying it by each whole number below it until one.
3! = 3*2*1 = 6
5! = 5*4*3*2*1 = 120
10! = 10*9*8*7*6*5*4*3*2*1 = 3,628,800
3,628,800 seconds / 60 = 60,480 minutes
1008 hours
42 days
6 weeks
6 Weeks * 7 days * 8 * 3 (24) hours * 2 * 4 * 5 * 9 * 10 (3600 = 60²) seconds
The last one is a bit of a jump, but 94 is 36 and 105*2 is 100 so together it’s 3600.
Fine, I’ll do the math:
60 seconds in a minute (10 × 6)
60 minutes in an hour (9 × 5 × 4 / 3)
24 hours in a day (8 × 3)
7 days in a week (7)
6 weeks (3 × 2)
The bold 3’s cancel out and become × 1, and then it’s easy to see each integer from 1 to 10 appears exactly once when it’s all multiplied together.
It’s like “there are 10 kinds of people in the world: those that can read binary, and those that can’t.”
It doesn’t work if you say it aloud.