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This is a riddle I encountered recently and I can't solve it.

What goes in place of the question mark? No other info is given.

enter image description here

EDIT: Apparently there are a lot of possible answers, so I'll give some extra info on the context in which I found this riddle. I found it in a schoolbook for children of about 10 to 12 years old. It's a Flemish textbook, so all word related answers should be with Dutch words. However, since this riddle was in a chapter about patterns and lists, I'm inclined to go with Radhato's answer.

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closed as too broad by Marius, Dan Russell, Deusovi, Engineer Toast, Beastly Gerbil Jun 23 '16 at 19:47

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Questions such as this are typically closed for being too broad, as the number of possible answers/explanations is very high. If you have any more information (What context was this riddle given in? Is this part of a set of similar puzzles?) that could help narrow the options, I would recommend adding it. $\endgroup$ – ShadowCat Jun 23 '16 at 18:45
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One of the many possiblities:

B

As

Considering the sum of characters in each row remain constant
C+F+O = 3+6+15 = 24
U+A+B = 21+1+2 = 24

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Given we have no information there could be a lot of possible answers..
One I've come up with is (the one that seems the most plausible to me)

J

Because

The letters 'a' and 'c' have one between them (b), the letters 'c' and 'f' have two between them (d, e), therefor the next letter would be J (F..g..h..i..J) to continute the pattern with three letters in between.
'J' to 'O' (k l m n = 4)
'O' to 'U' (p q r s t = 5)

Another possible answer would be

R

Because

U - F - O and C - A - R (both vehicles?)

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  • 2
    $\begingroup$ UFO is not a vehicle. It stands for "Unidentified flying OBJECT". everything that flies and you cannot identify is an UFO until you identify it. $\endgroup$ – Marius Jun 23 '16 at 12:13
  • $\begingroup$ I see @marius, was just another random idea that came to my mind while looking at the picture $\endgroup$ – Radhato Jun 23 '16 at 19:49
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It could also be

any of: A, B, D, F, K, L, N, O, P, R, U, W

Using the logic that

There is a missing third row where all letters are equal and reading columns top-to-bottom form words:
CUT, FAT, OAT
CUE, FAE, OBE
CUD, FAD, ODD
CUT, FAT, OFT
CUE, FAE, OKE
CUD, FAD, OLD
CUE, FAE, ONE
CUP, FAP, OOP
CUE, FAE, OPE
CUB, FAB, ORB
CUT, FAT, OUT
CUN, FAN, OWN

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