02-27-2012, 09:46 AM | #5806 |
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1. Tent?
I saw this (and the other two) on a TV program in the UK recently (or on the radio?). I guess you saw the same program? |
02-27-2012, 09:47 AM | #5807 |
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02-27-2012, 09:52 AM | #5808 |
Not scared!
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02-27-2012, 12:37 PM | #5809 |
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OK, one to work out rather than to know:
5,10,11,12,14,18,... What's the next number in the sequence and why? If no-one gets it in a day, I'll give another sequence that follows the same rule. |
02-27-2012, 02:07 PM | #5810 |
Now what?
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MATH QUESTION!!!!
[brain beginning to boil] |
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02-27-2012, 05:05 PM | #5811 |
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Would it help if I said it really is an arithmetic question (not a maths question, or some pseudo-artithmetic sequence*). That is, the rule for the sequence is simple, and only involves two of the four basic arithmetic functions. (i.e. two out of addition, subtraction, multiplication and division).
However, it is a sequence I haven't seen discussed a great deal. * i.e. it's not something like numbers in alphabetical order, or by length in roman numerals. It is the numbers that define the sequence, not some odd property of the numbers. |
02-27-2012, 07:14 PM | #5812 | |
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Quote:
Sorry, didn't say why: 5 to 10 is 5 10 to 11 is 1 11 to 12 is 1 12 to 14 is 2 14 to 18 is 4 That is the move to the next number seems to reflect the previous number, apart from the zero of 10 because you would never get anywhere with that. Therefore I added 8 to 18 and got 26. Last edited by Bookpossum; 02-27-2012 at 07:25 PM. Reason: Answering the second part of the question, and correcting my arithmetic (I originally put 24 'cos I can't add.). |
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02-27-2012, 07:20 PM | #5813 |
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02-27-2012, 07:30 PM | #5814 |
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Stitchawl |
02-28-2012, 03:32 AM | #5815 | |
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Quote:
I'm with Stitchy on these maths problems (and to think I got Maths, Advanced Maths and A Level Maths qualifications at school ). |
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02-28-2012, 03:15 PM | #5816 | |
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Quote:
26 is the next number. But after that the sequence is 38, 62, 74, 102, 104, 108, 116, 122, 126, 138, 162 |
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02-28-2012, 05:01 PM | #5817 |
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174, 202, 206, 218.....
It seems as if you multiply the digits of each number (ignoring 0), and then add the product to the number. But that doesn't explain how you got from 5 to 10. So I think what you do is square the product of the digits and then divide it by the product before adding it back, which would do it. But I don't have a good reason for ignoring those zeroes. Best I can do. |
02-28-2012, 05:29 PM | #5818 | |
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Quote:
5 -> 10 follows the same rules as the others. The product of the digits of 5 is 5. 5 + 5 = 10 Over to you! |
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02-28-2012, 06:27 PM | #5819 |
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Well done, issy. I never did really understand maths!
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02-28-2012, 06:30 PM | #5820 |
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Grr... I had just figured it out as well!
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