Olympiad Math: Problem of the Week (December 14 – December 21, 2013)


Weird subsets

How many subsets in {m,a,t,h,b,l,o,g,s}  have at least one vowel?


Comment your answer below.

 Note: I am the only one who can see your comments. You are only allowed to comment your answer once. Comments will be revealed next week December 21, 2013 (Philippines Time). You can also send your answer to techiemathteacher@gmail.com .  Please DON’T FORGET TO INCLUDE YOUR NAME AND THE NAME OF YOUR SCHOOL. Names of those who commented the correct answer will be posted in this page immediately after the answer has been reviewed. Happy Solving!

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Correct answer were submitted by:

1. Quant Master. (Identify yourself in comment please)

2. Jeffry Robles. University of the Philippines- Diliman

3. Arsh Singh. yourmathguru.com

4. Muthu Krishna. Kle College , Bengaluru

5. ambi ( tired of reminding)

6. Huzaifa Abbasi

7. Kennard Ong Sychingping, De La Salle University

8. John Michael Maninang. UST

9. Sukumar. (comment your name and school please)

10. Paolo Go. DLSU-D

11. Regin N. Manamba – University of Southern Mindanao-Kabacan

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8 Responses

  1. Quant Master says:

    2^9 – 2^7 = (2^2 – 1)2^7 = 384

  2. Michael Banaylo says:

    381? (3)(7C1 + 7C2 + … + 7C7)
    Michael Banaylo
    Negros Occidental HS

  3. Huzaifa Abbasi says:


  4. JM Maninang says:


    JM Maninang. UST

  5. sukumar says:

    the no of subset is 384

  6. Regin N. Manamba - University of Southern Mindanao-Kabacan says:

    384 subsets

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