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Difficult Math Question #25 - Sets

This topic has 3 member replies
800guy Master | Next Rank: 500 Posts Default Avatar
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Difficult Math Question #25 - Sets

Post Mon Oct 09, 2006 4:33 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    OA after some people answer...

    How many different subsets of the set {10,14,17,24} are there that contain an odd number of elements?

    (a) 3 (b) 6 (c) 8 (d) 10 (e) 12

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    gamemaster Senior | Next Rank: 100 Posts Default Avatar
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    Post Tue Oct 10, 2006 4:13 am
    4C1 + 4C3 = 8

    800guy Master | Next Rank: 500 Posts Default Avatar
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    Post Thu Oct 12, 2006 10:08 am
    here's the oa:

    8 is the answer. The different subsets are

    10,
    14,
    17,
    24,
    10, 14, 17

    14 17 24

    17 24 10

    24 10 14

    anandsebastin Junior | Next Rank: 30 Posts Default Avatar
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    Post Wed Oct 18, 2006 6:40 pm
    C

    subsets with one element - 4
    subsets with 3 elements - {10,14,17}, {10, 17,24}, {10,14,24}, {14,17,24} = 4. Total = 8

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