# Crazy number puzzle.. Any Mathematicians? [duplicate]

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

• I suggest changing the last one into 8466. Jun 25, 2015 at 11:02
• @No.7892142 they'll both be 'F' - see Rand's answer below Jun 25, 2015 at 11:04
• Precisely. Currently, 8066 would be "G" (the 8066 here would be "F", of course). Jun 25, 2015 at 11:06

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.

• That was fast ! (or probably due to my first question in this forum). Am unable to accept answer so quickly. Jun 25, 2015 at 11:02
• @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 :-) Jun 25, 2015 at 11:04
• Oops, I see it now Q#5734.. And you were the one 'edited' that question long ago ! Jun 25, 2015 at 11:09
• @S.Krishna This is at least the 4th duplicate of that question - it's certainly popular! Jun 25, 2015 at 11:20