If you count from 1 to 100, how many 7s will you pass on the way?
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JNU SSS 2012 Question 51: 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.
TestStop has 12 past-paper questions on this subtopic.
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Question from the JNU SSS 2012 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.