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Tag: counting

Math: combinations: a question from a text

By Jack Posted on February 11, 2016 Posted in math Tagged with combinations, combinatorics, counting

The tutor offers a solution to a textbook question about counting. On page 47 of my text Discrete and Combinatorial Mathematics (Grimaldi) is a question: If you want to select three distinct letters from the alphabet , arranged in alphabetical …

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Math: the pigeonhole principle: another example

By Jack Posted on October 29, 2014 Posted in math Tagged with counting, pigeonhole principle

Tutoring high school math, the pigeonhole principle might not come up very often.  Because of its applications to everyday life, the tutor often thinks of it. Back in my May 23 post, I introduced the pigeonhole prinicple. I pointed out …

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Math: the pigeonhole principle

By Jack Posted on May 23, 2014 Posted in math Tagged with counting, counting problems, pigeonhole principle

Tutoring math, you might see this topic from a university student.  The math tutor offers it as a point of interest. The pigeonhole principle is used to solve counting problems.  A simple example: In a ten day stretch, how many …

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Math: counting: multiply or add

By Jack Posted on March 29, 2014 Posted in math Tagged with counting

Tutoring math 12, you may discuss counting problems.  The tutor offers a quick guide for when to multiply vs when to add. One question you’re sometimes asked about counting is when you multiply, vs when you add.  The answer is …

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Math: A counting problem

By Jack Posted on January 30, 2014 Posted in math Tagged with choose, combination, counting, permutation, with replacement, without replacement

Tutoring math 12 and some university courses, you get asked about counting. The tutor opens the discussion with a couple of examples. Questions that ask, “How many ways can people be lined up for a photograph” or “how many five-card …

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