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Subjects
Class 11MathematicsPermutations and CombinationsPermutationsHard
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How many (5)-digit numbers can be formed from (1,2,3,4,5,6,7,8) without repetition in which (1) and (8) are adjacent?

Answer and explanation

Correct answer: (1800)

Treat (1) and (8) as a block and choose the other (3) digits from (6). The total is (\binom{6}{3}\cdot4!\cdot2!=960).

Related tags

PermutationsDigitsAdjacent DigitsPermutations And CombinationsMathematicsClass 11 Mcq
सुधार सुझाएँ / Earn

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