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13 July, 19:13

You are required to choose two topics from a list of five to write about on your science test. How many different pairings are possible?

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Answers (2)
  1. 13 July, 20:00
    0
    There are many 20 different pairings possible.
  2. 13 July, 20:08
    0
    A B C D E represent the subjects

    A+A1

    A+B2

    A+C3

    A+D4

    A+E5

    B+B6

    B+C7

    B+D8

    B+E9

    C+C10

    C+D11

    C+E12

    D+D13

    D+E14

    E+E15

    15 combos
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