Math Olympiad, I.S.I. Entrance and College Mathematics › Forums › Math Olympiad, I.S.I., C.M.I. Entrance › Problems for the week!

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- December 3, 2018 at 6:53 am #24574
Here are three problems for your brain!

**1**Can you glue edges of an octagon to make a two-holed torus!

(This week we are working on this idea in a geometry session at Cheenta.)

**2**We want to take a 672 degree polynomial with integer coefficients. Suppose we plugin 673th root of 1 in that polynomial and get 0.

What can you say about the integer coefficients of this polynomial?

(This problem will come up in a Complex Number and Geometry session this week.)

**3**We want to partition the number of shortest paths from (0,0) to (2019, 2019). You are allowed to walk only on the grid (lines with either x coordinate an integer or y coordinate an integer between 0 to 2019)

Can you take the vertical line x = 673 to partition these set of shortest paths into mutually exclusive and exhaustive subsets of paths?

(This problem will come up in a Combinatorics session this week.)

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