What number completes this sequence please?
1, 2, 68, 14, 21, 89, 49, 56, 37, 95
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$\begingroup$ Does the fact that 89 is 68 turned upside-down have anything to do with it? $\endgroup$– PotatoLatteCommented Jun 10, 2018 at 13:35
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$\begingroup$ @ZaniXu Well spotted, but no. $\endgroup$– O0123Commented Jun 10, 2018 at 13:52
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$\begingroup$ does the order of the numbers in the sequence you wrote matter? $\endgroup$– Emre UnsalCommented Jul 9, 2018 at 14:04
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2 Answers
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I think the answer is
5
because
it almost creates a pattern when we take the amount of the numbers
(ex: 1 used 3 times, 2 used 2 times etc.)
1-2-3-4-5-6-7-8-9 (numbers)
3-2-1-2-2-2-1-2-3 (amount of numbers in the sequence)
so
if we add 5 to the sequence the amount of numbers from 1 to 9 is going to be a pattern itself like 3-2-1-2-3-2-1-2-3
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$\begingroup$ Isn't there a lot of possibilities then? Maybe I didn't understand, what allows us to choose one among the others? $\endgroup$– UntitpoiCommented Jul 9, 2018 at 14:46
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$\begingroup$ I don't quite understand what you are asking. Can you explain your question more? $\endgroup$ Commented Jul 9, 2018 at 14:50
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1$\begingroup$ What if I use 73 or 233456778? It would also make a pattern. $\endgroup$– UntitpoiCommented Jul 9, 2018 at 14:54
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2$\begingroup$ If this is the right answer, then I would not consider the numbers in the question to be a sequence. Their order does not matter. The way the digits are composed into larger numbers does not matter. Those are essentially random aspects added to a collection of digits to make it look like a sequence even though it really isn't one. If the question had presented a (multi)set of digits and asked which one was missing, it would be more logical, but presenting it as a sequence is misleading and in my opinion then makes the answer rather unsatisfying. $\endgroup$ Commented Jul 9, 2018 at 15:36
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Does the fact that
14, 21, 49, 56, and 95 are all multiples of 7
have to do with it? My guess would be
102
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5$\begingroup$ I don't think 95 is a multiple of 7. $\endgroup$ Commented Jun 10, 2018 at 16:03
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5$\begingroup$ 102 isn't a multiple of 7 either... could you explain your reasoning a bit further, please? $\endgroup$ Commented Jun 10, 2018 at 16:27
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$\begingroup$ Also, answers need to be hidden in spoiler tags. In the unlikely event that this is the correct answer, you're currently spoiling it for anyone who wants to have a go at the puzzle themselves. $\endgroup$– F1KrazyCommented Jun 10, 2018 at 16:31
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$\begingroup$ It has nothing to do with multiples. $\endgroup$– O0123Commented Jun 10, 2018 at 23:24