Many books are available now!

Our group library, which used to be available for members only, is now available to everyone for download many great math books. We decided this because we want to increase chances for all Cambodian students to have enough sources to improve their education. Please click here to download

OEC freshman result!

Here are 4 of 6 successive applicants for last saturday test, if you see your name below, please follow the interview schedule(Saturday 08 August 2009) as following:

9am Choup Mithona
9:20am Heng Pagnarith
9:40am Heang Vanny
10am Meas Sopheaktra

Location : to be confirmed later
For more infomation, feel free to contact us 012 77 44 09

OEC ANNUAL Selection Test 2009

OEC is a non-profit organization whose mission is to advance the academic development of Cambodia students by disseminating information about foreign educational opportunities, providing assistance in the university application process, enhancing the educational experience, and ultimately building a network of young professionals who will bring social change to the community.

We are inviting the current grade 11, 12 and year 1 students who have high English proficiency to come for the mock TOEFL test to join the Annual OEC Program. This program has been in existence for several years and its aim is to assist the under-privileged but talented Cambodian students to apply for admission and financial aid/scholarship to pursue undergraduate study at elite US universities and colleges. We divide this test into 2 categories as following:

1.For 1st year students,

Test Date: 01 AUGUST 2009
Time: 0800am to 1130am
Venue: Cheythavy Thmei ( sala Chomnes Tou Tov ) Room : Kompong Cham

Minimum requirement for High school diploma : Grade C

P.S: Please confirm your attendance by emailing to group_cmg@yahoo.com along with your name, school, level of English and Phone number. No later than 30th July 2009, 12am.

2.For 11th and 12th grade,

Test Date: 09 AUGUST 2009
Time: 0800am to 1130am
Venue: Bak Touk High School

P.S: Please confirm your attendance by emailing to bunleang9@hotmail.com and group_cmg@yahoo.com along with your name, school, level of English and Phone number. No later than 2nd August 2009, 12am.

SEALNet (project cambodia) result!

Just don't want people who apply for SEALNet have doubt regarding the result, Here is the list of successive candidates:

Vuochlin Veung
Chea Sang
Vuochly Veung
Ting Layseang
Pal Sreyvin
Song Chhapon Mina
Lim Leanghour
Maro Chhum
Im Soryaphea
Iep Poachean
Khin Lyda
Taing Soklei
Pors Ponnary
Sourmolivann Lip
Chuop Mithona

IMO 2009 Germany - Day 1 Problems

Problem 1. Let n be a positive integer and let a1,a2,a3,...,ak ( k≥ 2) be distinct integer in the set { 1,2,...,n} such that n divides ai(ai+1-1) for i = 1,2,...,k-1. Prove that n does not divide ak(a1-1).

Problem 2. Let ABC be a triangle with circumcenter O. The points P and Q are interior points of the sides CA and AB respectively. Let K,L and M be the midpoints of the segments BP,CQ and PQ. respectively, and let Γ be the circle passing through K,L and M. Suppose that the line PQ is tangent to the circle Γ. Prove that OP = OQ.

Problem 3. Suppose that s1,s2,s3, ... is a strictly increasing sequence of positive integers such that the sub-sequences ss_{1},ss_{2},ss_{3}, ... and ss_{1+1},ss_{2+1},ss_{3+1}, ... are both arithmetic progressions. Prove that the sequence s1,s2,s3, ... is itself an arithmetic progression.