PROBLEMS FOR FEBRUARY
Please send your solution to
Ms. Valeria Pendelieva
641 Kirkwood Avenue
Ottawa, ON K1Z 5X5
no later than March 31, 2004.
It is important that your complete mailing address
and your email address appear on the front page.

290.

The School of Architecture in the Olymon
University proposed two projects for the new Housing Campus
of the University. In each project, the campus is designed
to have several identical dormitory buildings, with the same
number of onebedroom apartments in each building. In the
first project, there are 12096 apartments in total.
There are eight more buildings in the second project than in the
first, and each building has more apartments, which raises the
total of apartments in the project to 23625. How many buildings
does the second project require?

291.

The nsided polygon A_{1}, A_{2}, ¼, A_{n}
(n ³ 4) has
the following property: The diagonals from each of its vertices
divide the respective angle of the polygon into n2 equal angles.
Find all natural numbers n for which this implies that the polygon
A_{1} A_{2} ¼A_{n} is regular.

292.

1200 different points are randomly chosen on the
circumference of a circle with centre O. Prove that it is
possible to find two points on the circumference, M and N,
so that:
· M and N are different from the chosen 1200 points;
· ÐMON = 30^{°};
· there are exactly 100 of the 1200 points inside the
angle MON.

293.

Two players, Amanda and Brenda, play the following
game: Given a number n, Amanda writes n different natural
numbers. Then, Brenda is allowed to erase several (including none,
but not all) of them, and to write either + or  in front of
each of the remaining numbers, making them positive or negative,
respectively, Then they calculate their sum. Brenda wins the game
is the sum is a multiple of 2004. Otherwise the winner is
Amanda. Determine which one of them has a winning strategy, for
the different choices of n. Indicate your reasoning and
describe the strategy.

294.

The number N = 10101¼0101 is written using
n+1 ones and n zeros. What is the least possible value of
n for which the number N is a multiple of 9999?

295.

In a triangle ABC, the angle bisectors AM
and CK (with M and K on BC and AB respectively)
intersect at the point O. It is known that
AO ¸OM  = 
Ö6 + Ö3 + 1
2



and
CO ¸OK  = 
Ö2
Ö3  1

. 

Find the measures of the angles in triangle ABC.

296.

Solve the equation
5 sinx + 
5
2 sinx

 5 = 2 sin^{2} x + 
1
2 sin^{2} x

. 
