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Class 11MathematicsPermutations and CombinationsFundamental principle of countingExpert
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A (3)-digit number is to be formed using digits from (1) to (7). Digits may repeat and the number must be greater than (400). How many numbers can be formed?

Answer and explanation

Correct answer: (196)

The hundreds place has (4) choices: (4,5,6,7). The remaining two places have (7\times7) ways, giving (196).

Related tags

PermutationsCombinationsCounting PrincipleClass 11ExpertFundamental Principle Of CountingPermutations And CombinationsMathematics
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