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Class 11MathematicsPermutations and CombinationsFundamental principle of countingExpert
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Using digits (1,2,3,4,5,6,7), how many (6)-digit numbers can be formed without repetition such that (1) is never immediately before (2)?

Answer and explanation

Correct answer: (4440)

Subtract arrangements containing the block (12) from total (^{7}P_6). Only the fixed order (1) immediately before (2) is forbidden.

Related tags

DigitsBlock-MethodRestrictionFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
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