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Subjects
Class 11MathematicsPermutations and CombinationsFundamental principle of countingEasy
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A mobile passcode has three positions: the first is filled with one of 7 digits, the second with one of 4 letters, and the third with one of 3 symbols. How many passcodes are possible?

Answer and explanation

Correct answer: 84 passcodes

There are 7 choices for the first position, 4 for the second, and 3 for the third. Since one choice is made for each position, the total is 7 × 4 × 3 = 84 passcodes.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
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