Search found 6 matches

by Sudip Deb
Tue Jan 25, 2011 7:37 pm
Forum: Divisional Math Olympiad
Topic: A Problem
Replies: 4
Views: 1335

A Problem

x + 1/x = 6 . Find x .
by Sudip Deb
Tue Jan 25, 2011 7:26 pm
Forum: Secondary: Solved
Topic: Dhaka Secondary 2009/11
Replies: 4
Views: 1967

Re: Dhaka Secondary 2009/11

The k is 2009 .
by Sudip Deb
Tue Jan 25, 2011 7:23 pm
Forum: Secondary: Solved
Topic: Dhaka Secondary 2009/9
Replies: 10
Views: 4506

Re: Dhaka Secondary 2009/9

100 . Because there are 100 players who will play with each other . The question is not how many match played but how many player play all the match.
by Sudip Deb
Tue Jan 25, 2011 7:15 pm
Forum: Secondary: Solved
Topic: Dhaka Secondary 2009/2
Replies: 6
Views: 2984

Re: Dhaka Secondary 2009/2

D = 2 . Because DBC = 276
by Sudip Deb
Tue Jan 25, 2011 7:10 pm
Forum: Secondary: Solved
Topic: Dhaka Secondary 2010/6
Replies: 7
Views: 1942

Re: Dhaka Secondary 2010/6

There is an only number which is 3 and 3+1 is a sqare . :-)
by Sudip Deb
Tue Jan 25, 2011 7:00 pm
Forum: Secondary: Solved
Topic: Dhaka Secondary 2010/1
Replies: 2
Views: 1213

Re: Dhaka Secondary 2010/1

Suppose , the numbers are ( 1 -x ) and (1+ x)
so,
=>(1-x)(1+x) = 3 .
=>1 -x^2 = 3
=>-x^2 = 2
=> x^2 = -2
=> x = root(-2)
so, the numbers are (1-root(-2)) and (1+root(-2)) . Now its so easy .