Bunuel wrote:
Each runner during a race is labeled with a unique one-letter code or a unique two-letter code, where the two letters are different. The codes use the 26-letter English alphabet, and if a given two letter code is used then the reverse code is not used. What is the maximum number of runners that can receive unique codes for the race?
A. 325
B. 351
C. 377
D. 650
E. 676
No of label using one letter = 26
No of labels using two letters = 26*25 (first letter can be any 26 alphabet and second letter
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