Odd Sequence
8, ?, 4, ?, 1, ?, 6, ?, 2
Add some odd numbers to make the odd sequence logical (pun intended)
Add some odd numbers to make the odd sequence logical (pun intended)
Labels: mathemagic, outside-the-box, trickofmind
posted by Rajesh Lal at
8:33 AM
10 Comments:
the blanks might be 6, 2.5, 3.5, 4
and what is with these vague number puzzles that could be any sequence that the human mind could fathom ???????????
That does not work. Look at the commas. Unless it is a mistake the 2nd question mark does not have a comma after it. Therefore it should be a double digit number e.g. "11", "21" etc.
(1) Does "add some odd numbers" mean "only add odd numbers"?
(2) If so, my previous post is incorrect. It should read "11", "31", "51" etc.
(3) If so, the sequence is:
even,odd,even,odd,odd,even,odd,even
(4) If so, there are two odd numbers in sequence and therefore there are not two separate odd and even sequences.
(5) "Some" makes the puzzle ambiguous. Can it mean that as long as you add "some" odd numbers you can also add even numbers?
(6) Eric's post makes no sense because it means the 4th number in the sequence would be "2.51"
(7) The Question Master has to cure the ambiguities before we can attempt this puzzle. Please!
Added the missing comma, my bad
You guys are reading between the lines :)
Sorry Rajesh,
I had already posted this:
http://www.stevencarrigan.com/blog/2008/07/is-this-puzzle-wrong.html
You may wish to post a comment.
We are supposed to read between the lines! Otherwise, what is the point?
Regards,
Steven.
There is still no "seperate" odd sequence and you did not answer the other questions.
The question or problem must itself be logical and capable of a logical solution.
Regards,
Steven.
Insert 5, 9, 7 and 3 in place of the question marks. This keeps the alphabetic sequence of the numbers when spelled out:
i.e. eight, FIVE, four, NINE, one, SEVEN, six, THREE, two.
Chris
1 7 3 1 would be my guess.
The complete sequence:
8,1,4,7,1,3,6,1,2
Series of 3 numbers, the first counting down from 8, then 7, then 6. The middle always a 1. The 3rd, counting down from 4, then 3 then 2.
All odd entries, keeping the pattern. Yes?
Spooled
Surprise, Arizona
8, ?, 4, ?, 1, ?, 6, ?, 2
8, a, 4, b, 1, c, 6, d, 2
the numbers don't mather as long as
a+d=10
b+c=10
A+D=10, B+C=10, possibly, but there's no relationship between the two sequences, and the 1 doesn't contribute to the pattern, or wouldn't support a continuation of the sequence.
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