The Math Division

The Math Division Math Tutoring, including Test Preparation; Educational Consulting. Online/Zoom sessions available.

09/03/2026

More weird cat behavior (Lucy).

11/20/2022

I

07/30/2021

Somewhat challenging combinatorics problem:

Five ping pong balls are placed in an urn. They are numbered one to five. Without looking, Kathy selects some number of balls (at least one) from the urn. If the numbers on the balls selected are added together, how many selections will result in an odd sum? (count in such a way that order doesn’t matter, i.e., 1-4 is the same as 4-1).

08/13/2020
Oblate Spheroid in Geogebra.
07/19/2020

Oblate Spheroid in Geogebra.

07/12/2020

Address

New York, NY

Opening Hours

Monday 9am - 8pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 8pm
Friday 9am - 5pm

Telephone

+19174530516

Website

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