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[Birthday Contest 2] EMS Maths - Winner payfor520
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Author Topic: [Birthday Contest 2] EMS Maths - Winner payfor520  (Read 3662 times)
Miguel
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hypnotized much?

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Jul 11, 2009 09:37 AM

This one should be a bit more difficult and put your brains working for the next contest.

Only 1 person will get the prize as there is only one possible answer.

Here is the question:
How many 3 digit numbers have no repeated digits?

The answer to this problem has a value of $2. Don't worry, this $2 are just to get you started, there will be more contests with greater prizes!
« Last Edit: Jul 11, 2009 09:49 AM by caetanomiguelp » Logged

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jpsportugal
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Reply #1: Jul 11, 2009 09:38 AM

720?
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Miguel
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hypnotized much?

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Reply #2: Jul 11, 2009 09:39 AM

nope
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jpsportugal
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Reply #3: Jul 11, 2009 09:42 AM

001-999?
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Miguel
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Reply #4: Jul 11, 2009 09:43 AM

maybe
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payfor520
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Reply #5: Jul 11, 2009 09:47 AM

648.

There are 9 possibilities for the first digit. There are also 9 possibilities for the second digit since 0 can be used. The second digit cannot equal the first digit. The third digit cannot equal either the first or the second, so there are 8 possibilities for it. Thus there are 9 * 9 * 8 = 648 three digit numbers with no repeated digits.

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Miguel
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Reply #6: Jul 11, 2009 09:48 AM

Correcto!

This one was quick. PM me your payment details, AP or PP, you choose.
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The Rock
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Reply #7: Jul 11, 2009 09:49 AM

648.

There are 9 possibilities for the first digit. There are also 9 possibilities for the second digit since 0 can be used. The second digit cannot equal the first digit. The third digit cannot equal either the first or the second, so there are 8 possibilities for it. Thus there are 9 * 9 * 8 = 648 three digit numbers with no repeated digits.



Nice. You could also try the long way, but that's why I lost.
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saketasati
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Reply #8: Jul 11, 2009 09:57 AM

Wow nice, congrats payfor520 clap clap
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asepms
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Reply #9: Jul 11, 2009 10:02 AM

Congratz payfor520  clap
I was too late 6.48 minute in calculating  frusty
Anyway, I like this game  dance2
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The Rock
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Reply #10: Jul 11, 2009 10:03 AM

Congratz payfor520  clap
I was too late 6.48 minute in calculating  frusty
Anyway, I like this game  dance2


I lost by 25 seconds, try writing 72 numbers in <1 minute Tongue
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makingendsmeet
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IF YOU HAVE TO PAY IN ORDER TO BE PAID - RUN

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Reply #11: Jul 11, 2009 10:17 AM

confrats   clap

let me guess that was the new math,


wow , I had no idea what the questioned meant .... lol

man been out of school to long ...
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Miguel
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hypnotized much?

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Reply #12: Jul 11, 2009 10:30 AM

lol read the attachment and read this post:
648.

There are 9 possibilities for the first digit. There are also 9 possibilities for the second digit since 0 can be used. The second digit cannot equal the first digit. The third digit cannot equal either the first or the second, so there are 8 possibilities for it. Thus there are 9 * 9 * 8 = 648 three digit numbers with no repeated digits.

Still, he got it first and he won! Smiley


* readit.png (21.57 KB, 1156x268 - viewed 236 times.)
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jpsportugal
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Reply #13: Jul 11, 2009 10:31 AM

ROFLMAO. Knew it before.
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The Rock
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Reply #14: Jul 11, 2009 10:33 AM

ROFLMAO. Knew it before.

And I knew it before you knew it because vasishta told me Tongue he saw it first Smiley
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