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Finding number of patients with all three complaints

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#problem-solving #inclusion-exclusion
67
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Solving an inequality in 2 similar ways gives opposite solution

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#inequality #problem-solving
50
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Show that sequence of composition of function $f(n) = n + \lfloor{\sqrt{n}}\rfloor$ contains at least one perfect square.

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#number-theory #problem-solving #ceiling-and-floor-functions
53
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A problem from elementary number theory

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#elementary-number-theory #problem-solving
855
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Find the value of x such that

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#algebra-precalculus #complex-numbers #roots #quadratics #problem-solving
54
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Problem solving approach in this case (about series and combinatorics maybe)

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#sequences-and-series #combinatorics #problem-solving
109
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Help with elementary real analysis problem

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#calculus #real-analysis #derivatives #contest-math #problem-solving
366
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How to get an equation that output the end point of an angle line in rectangle?

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#geometry #algebra-precalculus #contest-math #problem-solving
318
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When should one use a counting argument to prove the existence of an object?

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#soft-question #problem-solving
271
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Large-scale Coordinated Research in Mathematics

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#reference-request #open-problem #advice #problem-solving
39
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Trouble on writing the function for an account record pagination problem

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#calculus #functions #problem-solving
1.2k
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Counting digits in an arithmetic sequence

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#sequences-and-series #algorithms #contest-math #problem-solving
687
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How to solve for $x$ in $\frac{200}{x+10} = \frac{200}{x} -1$?

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#algebra-precalculus #problem-solving
11.4k
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How to solve a problem with chessboard

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#problem-solving
607
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How to find the lowest cost supplier-product mix?

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#algorithms #optimization #problem-solving

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