How many 4-digit numbers can be formed, if no digit is used more than once?
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JNU SSS 2011 Question 73: Combinatorics and counting
Answer and worked solution
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Combinatorics and counting has come up 24 times in 5 exams since 2009.
What this question tests
This question is on Permutations and combinations, part of Combinatorics and counting in Mathematics.
Counting arrangements and selections, with and without restrictions.
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Question from the JNU SSS 2011 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.