Otis
Elite Member
- Joined
- Apr 22, 2015
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The sequence ABCDDCBA has two each of the letters A, B, C, and D. In the sequence, there are zero letters between the D's, two letters between the C's, four letters between the B's, and six letters between the A's.
Rearrange the letters ABCDDCBA in a row so that there is one letter between the D's, two letters between the C's, three letters between the B's and four letters between the A's.
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[imath]\;[/imath]
Rearrange the letters ABCDDCBA in a row so that there is one letter between the D's, two letters between the C's, three letters between the B's and four letters between the A's.
?
[imath]\;[/imath]