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This question already has an answer here:

Below is a sequence of four-digit numbers and characters that are associated with them.
Can you crack the code and find out what 2963 = ?

8446 = F
5697 = C
2331 = A
1125 = A
1662 = C
4658 = E
8312 = C
6146 = D
4115 = B
8066 = F
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marked as duplicate by Rand al'Thor, Community Jun 25 '15 at 11:09

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    $\begingroup$ I suggest changing the last one into 8466. $\endgroup$ – No. 7892142 Jun 25 '15 at 11:02
  • $\begingroup$ @No.7892142 they'll both be 'F' - see Rand's answer below $\endgroup$ – S.Krishna Jun 25 '15 at 11:04
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    $\begingroup$ Precisely. Currently, 8066 would be "G" (the 8066 here would be "F", of course). $\endgroup$ – No. 7892142 Jun 25 '15 at 11:06
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2963 equals

C,

because

given a number, count the total number of holes in all its digits, add 1, and take the letter at this position in the alphabet.

2331 and 1225 go to A because

they have no digits with holes,

5697 and 1662 go to C because

they have exactly 2 holes,

8446 goes to F because

it has exactly 5 holes,

and so on.

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  • $\begingroup$ That was fast ! (or probably due to my first question in this forum). Am unable to accept answer so quickly. $\endgroup$ – S.Krishna Jun 25 '15 at 11:02
  • $\begingroup$ @S.Krishna Welcome to Puzzling! Unfortunately I think your question counts as a duplicate, since this holes-in-digits thing has been asked before. I'll upvote it and then vote to close, but don't take this the wrong way - it's a good puzzle (as evidenced by its popularity!) and I hope you'll go on to post more nice puzzles here :-) $\endgroup$ – Rand al'Thor Jun 25 '15 at 11:04
  • $\begingroup$ Oops, I see it now Q#5734.. And you were the one 'edited' that question long ago ! $\endgroup$ – S.Krishna Jun 25 '15 at 11:09
  • $\begingroup$ @S.Krishna This is at least the 4th duplicate of that question - it's certainly popular! $\endgroup$ – Rand al'Thor Jun 25 '15 at 11:20

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