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500 ds test11 #24

This topic has 2 member replies
dunkin77 Master | Next Rank: 500 Posts Default Avatar
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500 ds test11 #24

Post Thu Apr 19, 2007 12:16 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    24. If b is the product of three consecutive positive integers c, c + 1, and c + 2, is b a multiple of 24 ?

    (1) b is a multiple of 3,
    (2) c is odd.


    Hi,

    I thought the answer is E) but actually the answer is A) --- Can anyone please explain??

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    jayhawk2001 Community Manager
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    Post Thu Apr 19, 2007 10:07 pm
    dunkin77 wrote:
    24. If b is the product of three consecutive positive integers c, c + 1, and c + 2, is b a multiple of 24 ?

    (1) b is a multiple of 3,
    (2) c is odd.


    Hi,

    I thought the answer is E) but actually the answer is A) --- Can anyone please explain??
    I'm not sure how it can be A.

    Take 3*4*5 - clearly not a multiple of 24.
    Take 23*24*25 - clearly a multiple of 24

    So, insufficient.

    Actually 1 doesn't tell us anything that we already don't know.

    Product of 3 consecutive positive integers HAS to be a multiple of 3
    3*4*5, 4*5*6, 5*6*7 etc. are all multiples of 3.

    dunkin77 Master | Next Rank: 500 Posts Default Avatar
    Joined
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    Post Fri Apr 20, 2007 6:28 am
    Thank you jay for confirming it. Smile

    I checked the answer again but it says A) -- I think the answer in textbook must be wrong! Confused

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