5! is the symbol for Factorial 5 , ie 5 x 4 x 3 x 2 = 120 different ways
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There are 16 ways that four cars can be parked in a row of four parking spaces. You would multiply the number of cars by the number of spaces.
0,2,4,6,8,10,12,14,16,18,20
6ways. represent boys as<.> girls as</> 1=///..... 2=.///.... 3=..///... 4=...///.. 5=....///. 6=...../// here may be the boys can arranged different ways. 5 boys arranged 5! = 120 ways. In 120 times, each time added girls 6 ways like the above way. so answer is 6*120 = 720 ways we can arrange.
A-M was on the bottom row and N-Z was on the top row
they arranged it from the top row to the bracket on the keyboard.