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A five-place password is made using 6 available symbols. The first two places must contain different symbols, and the last two places must contain the same symbol. Repetition is allowed in other positions. How many passwords are possible?

Answer and explanation

Correct answer: 1080 passwords

The first place has 6 choices and the second has 5 because it must differ from the first. The third place has 6 choices, and the equal fourth-and-fifth pair has 6 choices. Thus, 6 × 5 × 6 × 6 = 1080 passwords.

Related tags

Fundamental Counting PrincipleClass 11 MathematicsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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