Anonymous
Anonymous asked in Science & MathematicsMathematics · 4 months ago

Interesting combinatorics ?

20 people exchanged photos between themselves. How many photos there were if each person gifted a photo to another person.

3 Answers

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  • 4 months ago
    Favourite answer

    Each of the 20 people handed out 19 pictures of themselves to the other people.

    20 × 19 = 380 photos

  • Dixon
    Lv 7
    4 months ago

    Neither interesting or combinatorics

  • 4 months ago

    20*19...................

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