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Class 11MathematicsPermutations and CombinationsFundamental principle of countingExpert
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A (4)-digit number is formed using (2,3,4,5,6,7). Digits cannot repeat and the number must be odd. How many numbers can be formed?

Answer and explanation

Correct answer: (180)

The last digit can be chosen from (3,5,7) in (3) ways. The remaining places have (5\times4\times3) ways, giving (180).

Related tags

PermutationsCombinationsCounting PrincipleClass 11ExpertFundamental Principle Of CountingPermutations And CombinationsMathematics
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