SOLUTION: How many ways can 19 boys and 2 girls be arranged in sequence

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Question 1109902: How many ways can 19 boys and 2 girls be arranged in sequence
Answer by ikleyn(52776) About Me  (Show Source):
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In all, there are 21 = 19+2 persons to be arranged in sequence.


Anyone of     21           persons can be placed in the 1-st position.

Anyone of the 20 remaining persons can be placed in the 2-nd position.

Anyone of the 19 remaining persons can be placed in the 3-rd position.


   . . . and so on . . . 


In all, there are 21! arrangements.

Solved.