Kay has a playlist of 10 songs. She has time to listen to 4 of the songs on her way to school. How many different arrangements of 4 songs are possible? Enter the answer in the box.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

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