CMS/SMC
Canadian Mathematical Society
www.cms.math.ca
Canadian Mathematical Society
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PROBLEMS FOR NOVEMBER

Please send your solution to

Ms. Valeria Pendelieva
641 Kirkwood Avenue
Ottawa, ON K1Z 5X5

no later than December 15, 2003. It is important that your complete mailing address and your email address appear on the front page.


269.
Prove that the number
N = 2 ×4 ×6 ××2000 ×2002+ 1 ×3 ×5 ××1999 ×2001
is divisible by 2003.

270.
A straight line cuts an acute triangle into two parts (not necessarily triangles). In the same way, two other lines cut each of these two parts into two parts. These steps repeat until all the parts are triangles. Is it possible for all the resulting triangle to be obtuse? (Provide reasoning to support your answer.)

271.
Let x, y, z be natural numbers, such that the number
x - y
Í

2003

y - z
Í

2003
is rational. Prove that
(a) xz = y2;
(b) when y 1, the numbers x2 + y2 + z2 and x2 + 4z2 are composite.

272.
Let ABCD be a parallelogram whose area is 2003 sq. cm. Several points are chosen on the sides of the parallelogram.
(a) If there are 1000 points in addition to A, B, C, D, prove that there always exist three points among these 1004 points that are vertices of a triangle whose area is less that 2 sq. cm.
(b) If there are 2000 points in addition to A, B, C, D, is it true that there always exist three points among these 2004 points that are vertices of a triangle whose area is less than 1 sq. cm?

273.
Solve the logarithmic inequality
log4 (9x - 3x - 1) log2 Í5 .

274.
The inscribed circle of an isosceles triangle ABC is tangent to the side AB at the point T and bisects the segment CT. If CT = 6Í2, find the sides of the triangle.

275.
Find all solutions of the trigonometric equation
sinx - sin3x + sin5x = cosx - cos3x + cos5x .

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