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#26 2005-08-06 20:38:59

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,711

Re: sequence

Excuse me ... NO ANSWER ??

I feel somehow that we have been ripped off.

So let US say that the answer is 42 and move our lives on as best we can.


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#27 2005-08-07 02:34:26

master
Member
Registered: 2005-08-04
Posts: 23

Re: sequence

for anyone interested in answers, here is the address.

http://www.mathwizz.com/contest/answers.asp

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#28 2005-08-07 10:35:15

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,711

Re: sequence

Oh GOOD ...

Ahhh ... so it was a pattern of adding, subtracting or multiplying by the prime number sequence ... how devilish.

The pattern was:
Odd turn: (Even number: +, Odd number x) 
Even turn: Even number:    -, Odd number +)

Since the next prime number in the sequence was 37, and the next operation was multiply, then the answer was 1125 x 37 = 41625.

(The inherent problem with sequence questions, though, is that there can be multiple "right" answers.)


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#29 2005-08-07 10:43:37

master
Member
Registered: 2005-08-04
Posts: 23

Re: sequence

so true. their answer depends on the ways you solve, how you look at the problem, etc. this one was a little ... over the edge. who would have thought of a sequence consisting add, subtract, multiply, and division of prime numbers?

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#30 2005-08-07 14:36:01

master
Member
Registered: 2005-08-04
Posts: 23

Re: sequence

it lasts until december, and starts again next year too!

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#31 2005-08-07 19:23:33

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: sequence

Way ahead of you. I've joined, have done this week's standard and bonus puzzles and am doing the reruns every day. big_smile
Current points: 86.
I'm still confused about how they can publish answers but then give the puzzles in the reruns though.


Why did the vector cross the road?
It wanted to be normal.

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#32 2005-08-08 03:41:20

master
Member
Registered: 2005-08-04
Posts: 23

Re: sequence

welcome! im the one in second place, namey
i think its sometimes quite challengeing, and you can learn lots of stuff from it!

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#33 2005-08-08 03:52:43

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: sequence

And I'm the one in seventeenth place, name: sam.
Of course that's a fake name as everyone knows my real name is mathsyperson. smile


Why did the vector cross the road?
It wanted to be normal.

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