mathcounts notes

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Links, notes, Hints or/and solutions to 2014 Mathcounts state harder problems. 2014, 2015 Mathcounts state are harder  Sprint round: ...

#24 – Probability (Unfair Coin) Gloria has an unfair coin. Let \( p \) be the probability of heads, with \( \tfrac{1}{2} < p < 1...

There are numerous similar triangle questions on Mathcounts. Here are the basics: If two triangles are similar, their correspond...

This question is similar to, but more difficult than the 2023 Mathcounts Chapter Sprint #30, which is as follows: Consid...

The following notes are from Vinjai, a student I met online. He graciously shares and offers the tips here on how to tackle those harde...

9. In the figure below, quadrilateral CDEG is a square with CD = 3, and quadrilateral BEFH is a rectangle. If EB = 5, how many units is BH? ...

2012 Mathcounts State Sprint #30: In rectangle ABCD, shown here, point M is the midpoint of side BC, and point N lies on CD such that DN:NC ...