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Math Problem -- Grid Possibilities -- (TOUGH)

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Re: Math Problem -- Grid Possibilities -- (TOUGH)

Unread postby jasonraymondson » Mon 05 Nov 2007, 01:01:23

$this->bbcode_second_pass_quote('Carlhole', 'W')ell, I didn't get Jayson's paths problem but here's one I DID get years ago:

A son of a mathematician needs money for books and college tuition. So he writes a note to his father which says:

[align=center]Image[/align]

His father gets the note, thinks for a bit, and then writes a check for the total of books and tuition. What were the amounts?

I haven't re-solved it to get the answer again. But I know HOW I solved it. And the correct answer will be self-evident to anyone who does get it because the sum will make sense.



I am to tired to think about it much more, but it is

1

0

6

5

2
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Re: Math Problem -- Grid Possibilities -- (TOUGH)

Unread postby Carlhole » Mon 05 Nov 2007, 02:34:17

$this->bbcode_second_pass_quote('jasonraymondson', '')$this->bbcode_second_pass_quote('Carlhole', 'W')ell, I didn't get Jayson's paths problem but here's one I DID get years ago:

A son of a mathematician needs money for books and college tuition. So he writes a note to his father which says:

[align=center]Image[/align]

His father gets the note, thinks for a bit, and then writes a check for the total of books and tuition. What were the amounts?

I haven't re-solved it to get the answer again. But I know HOW I solved it. And the correct answer will be self-evident to anyone who does get it because the sum will make sense.



I am to tired to think about it much more, but it is

1

0

6

5

2


Well, the answer would be in sum form - "SEND" + "MORE" = "MONEY" as in the .gif above - except with real numbers, of course.
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Re: Math Problem -- Grid Possibilities -- (TOUGH)

Unread postby Andrew_S » Mon 05 Nov 2007, 06:24:19

$this->bbcode_second_pass_quote('jasonraymondson', '
')Ok I get that, but was is the probability ot each individual having more that two allelas per gene locus? This was always so tough for me to understand.


In diploid organisms like us, we generally have 2 copies of each gene (men have only one of some genes on the sex chromosomes though ). If these are identical copies we have one allele (2x the same allele) or else two (different) alleles.

Maybe you thinking of the probability of an individual being homozygous (2x same allele) or heterozygous (2 different alleles). If we know the frequency of each allele in the population and assume the population is panmictic (all possible matings in the population occur with equal probability) this is determined by the Hardy-Weinburg equation. So if alleles A and B are at frequencies p and q respectively (and p + q = 1.0) prob(AA) = pp, prob(BB) = qq and prob(AB) = 2pq.
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Re: Math Problem -- Grid Possibilities -- (TOUGH)

Unread postby Andrew_S » Mon 05 Nov 2007, 06:36:15

$this->bbcode_second_pass_quote('PenultimateManStanding', 'I') majored in Geology because I always liked being out in the countryside among the rocks and hills. What I valued most from my studies was gaining a sense of time, true time and the passing of eons.


I did geology at school (quite unusual in England as most schools don't offer it). Field trips were fun, out for a day in the countryside smashing up rocks looking for fossils or at the beach looking for fossilized sharks' teeth. The county of Kent in England, where I was, is a textbook example of sedimentary layers which have been pushed up in the middle and then eroded, so it's a bit like an onion sliced so you see the different layers.

I don't remember the mnemonic to remember all the geological periods in their correct order. Do you know any?
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