Algebra
Aptitude

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Q.

A lock has a code consisting of five distinct letters, from among the first eleven words of English alphabet. The lock opens, if any three letters of the code match occurring not in the same position. What is the least number of five-letter codes, one should try to be sure that the lock is opened?

 A.

7

 B.

4

 C.

6

 D.

5

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Solution:
Option(D) is correct

If the following five five-letters codes are tried then the lock will open, no matter what will be the original code:

ABCDE
FGHIJ
FGHIK
FGHJK
FGIJK


(1) Comment(s)


Vivek
 ()

Did not understand a single alphabet of the solution. Can u please explain what the question is trying to say. The language of the questions appears to be vague.