Which is the odd one out?
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| | 12 votes (75%) | ||
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16 members have voted
June 27th, 2019 at 4:23:12 AM
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I am going to put this puzzle in a poll format since my last attempt did not go well as far as readability. Which of these 6 4digit numbers is the odd one out? And note, it is not because F) 9568 begins with an odd number. I will post the answer as I am not good at spoilers in a day or so.
June 27th, 2019 at 7:07:33 AM
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Quote: avianrandyI am going to put this puzzle in a poll format since my last attempt did not go well as far as readability. Which of these 6 4digit numbers is the odd one out? And note, it is not because F) 9568 begins with an odd number. I will post the answer as I am not good at spoilers in a day or so.
I'm surprised I got the answer. For each number but one, the sum of its first and second digits equals the sum of its third and fourth.
June 27th, 2019 at 8:06:02 AM
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Quote: ChesterDogI'm surprised I got the answer. For each number but one, the sum of its first and second digits equals the sum of its third and fourth.
Same here. Ez
June 27th, 2019 at 8:42:43 AM
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A) 2745
B) 4967
C) 8594
D) 6271
E) 4773
F) 9568
but F is the only number that does start with an odd number...Quote: avianrandyAnd note, it is not because F) 9568 begins with an odd number.
D) is the only number that ends with a (1)
C) is the only number ending with an even digit less than 8
here is a good one
C) is the only number that does NOT show anywhere (at least once) in any of the 1st 400 Fibonacci numbers (1st number = 1)
A)2745 does show in F(258)
Line 262: [258,] 370959230771131880927453318055001997489772178180790104
A)2745 does show in F(258)
Line 262: [258,] 370959230771131880927453318055001997489772178180790104
forgot the obvious
E) sum of digits is the only odd sum. in other words,The only number that has 3 odd digits.
Last edited by: 7craps on Jun 27, 2019
winsome johnny (not Win some johnny)
June 27th, 2019 at 9:59:58 PM
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The answer I had was,what chesterdog and rs stated. I concede your answers to be correct,but e was what I had in mind. Definitely not a,athlete with theorems and such. It was just a,fun puzzle and I thought it was cute. Sorry I upset you 7craps
June 28th, 2019 at 6:03:28 AM
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It's hard to balance the difficulty of a puzzle for your audience.
How about this sequence? 2,3,5,7,2,4,8,1,5,2,4,1,5,7,2,8,5,7,4,8,1,7,2,8,7,
How about this sequence? 2,3,5,7,2,4,8,1,5,2,4,1,5,7,2,8,5,7,4,8,1,7,2,8,7,
June 28th, 2019 at 7:12:31 AM
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LOL.Quote: avianrandyThe answer I had was,what chesterdog and rs stated. I concede your answers to be correct,but e was what I had in mind. Definitely not a,athlete with theorems and such. It was just a,fun puzzle and I thought it was cute. Sorry I upset you 7craps
sure, my answers are correct but not for the reason you selected. I was only asking why your reason was the correct one, as there are many other correct reasons.
many other math experts have in the past, trying to pass off a 'math puzzle' on their terms instead of seeing it in a different light (example: answer is X and for reason Z and NOT reason W) and of not actually making a math mistake. (Martin Gardner made more than 1 math mistake in his writings about his math puzzles). your puzzle does not seem to include a 'math mistake'
the answer could also be D: 6271
the reason is, it is the only number from the given list of numbers to show 'more than 2 times' in the largest known Fibonacci prime number (proven).
F(104911) 21,925 digits long (some say big) can be found here:
largest known Fibonacci prime number (proven)
winsome johnny (not Win some johnny)
June 28th, 2019 at 1:40:02 PM
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The one I picked is the only one that looks like a number when you enter it on a calculator and turn it upside down. I'll leave it to the reader to work out which one!
June 28th, 2019 at 1:49:43 PM
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A) 2745
B) 4967
C) 8594
D) 6271
E) 4773
F) 9568
95>68.
F) is the only number where the 1st 2 digits are greater than the last 2 digits.
that makes F THE ODD ONE OUT
winsome johnny (not Win some johnny)
June 28th, 2019 at 2:12:38 PM
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I see, at the time of writing, that 4773 is the favourite to be the odd one out.
MOD(27-45) = 18
MOD(49-67) = 18
MOD(85-94) = 9
MOD(62-71) = 9
MOD(47-73) = 26
MOD(95-68) = 27
So only 26 isn't a multiple of 9. It's similar logic to looking at the total of the digits 2+7=9 and 4+5=9 etc. where 4+7 doesn't equal 7+3.
MOD(27-45) = 18
MOD(49-67) = 18
MOD(85-94) = 9
MOD(62-71) = 9
MOD(47-73) = 26
MOD(95-68) = 27
So only 26 isn't a multiple of 9. It's similar logic to looking at the total of the digits 2+7=9 and 4+5=9 etc. where 4+7 doesn't equal 7+3.
June 30th, 2019 at 8:17:40 PM
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clearly 4773 is the odd one out. On all the other numbers the sum of the first two digits is equal to the sum of the last two digits. But with 4773, 4+7 +11 and 7+3=10, and 111 doesn't equal 10.
So many better men, a few of them friends, are dead. And a thousand thousand slimy things live on, and so do I.
July 3rd, 2019 at 8:20:31 AM
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(A) is the only year that humanity has a small chance of seeing before going extinct.
Reperiet qui quaesiverit
July 3rd, 2019 at 1:07:37 PM
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Try this sequence:
1)
2) 19116912
3)
4) 05027114
5) 30077115
6) 20047216
7)
What is #1?
What is #7?
What about #3?
1)
2) 19116912
3)
4) 05027114
5) 30077115
6) 20047216
7)
What is #1?
What is #7?
What about #3?
Simplicity is the ultimate sophistication - Leonardo da Vinci
July 3rd, 2019 at 3:37:04 PM
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I like it...a nice surprise when the penny dropped.Quote: AyecarumbaTry this sequence:....1) 2) 19116912 3) 4) 05027114...7) ...
Think about one of the Twelve Olympians for a massive clue
Apollo finishes flying around
