Search found 62 matches

by Ragib Farhat Hasan
Tue Aug 28, 2018 1:45 am
Forum: Combinatorics
Topic: Placing Bishop in a chess board
Replies: 6
Views: 5403

Re: Placing Bishop in a chess board

I think the answer is 8.
by Ragib Farhat Hasan
Tue Aug 28, 2018 1:19 am
Forum: Social Lounge
Topic: BDMO Forum Mafia #2
Replies: 30
Views: 23688

Re: BDMO Forum Mafia #2

A sad ending to Zawad's efforts.
by Ragib Farhat Hasan
Tue Feb 23, 2016 9:15 pm
Forum: Number Theory
Topic: Tuymaada 2008,Junior League,D2,P8
Replies: 2
Views: 1286

Re: Tuymaada 2008,Junior League,D2,P8

What is t=501?
by Ragib Farhat Hasan
Mon Jan 25, 2016 10:44 pm
Forum: Social Lounge
Topic: A frequently asked question (FAQ)
Replies: 3
Views: 1810

Re: A frequently asked question (FAQ)

asif e elahi wrote:Of course. But set square is not allowed in IMO.
Is protractor allowed in IMO?
by Ragib Farhat Hasan
Mon Jan 25, 2016 8:39 pm
Forum: Social Lounge
Topic: A frequently asked question (FAQ)
Replies: 3
Views: 1810

A frequently asked question (FAQ)

Is geometry box allowed in Divisional Math Olympiad, National Math Olympiad (BdMO) or International Math Olympiad (IMO)?
by Ragib Farhat Hasan
Mon Jan 18, 2016 7:12 pm
Forum: Divisional Math Olympiad
Topic: Dhaka regional 2015 secondary/4
Replies: 2
Views: 1405

Dhaka regional 2015 secondary/4

ABCD is a parallelogram and it’s diagonals meet at point O. P and Q are the
midpoints of AO and BC consecutively. ∠A = ∠DPQ and ∠DBA = ∠DQP. If AB=2 unit, then find out the area of ABCD.
by Ragib Farhat Hasan
Sat Jan 16, 2016 8:16 pm
Forum: H. Secondary: Solved
Topic: Dhaka Higher Secondary 2010/9
Replies: 7
Views: 5129

Re: Dhaka Higher Secondary 2010/9

Total no. of numbers formed is 12.
The maximum sum is 888.
by Ragib Farhat Hasan
Thu Jan 14, 2016 7:45 pm
Forum: Divisional Math Olympiad
Topic: Dhaka regional higher secondary/8
Replies: 3
Views: 1866

Dhaka regional higher secondary/8

For all positive integers x,y; f(x) ≥ 0 and f(xy) = f(x) + f(y). If the digit at
the one’s of x is 6, then f(x) = 0. If f(1920) = 420 then f(2015) =?
by Ragib Farhat Hasan
Thu Jan 14, 2016 7:32 pm
Forum: Higher Secondary Level
Topic: A problem of combinatorics
Replies: 9
Views: 10644

Re: A problem of combinatorics

The actual solution to this problem is like this- 1 can shook hands with a max. of 35 people. Then 2 can shook hands with a max. of 34 people (this is the total handshake made including the handshake with the 1st person). Then 3 with max. 33, 4 with 32, 5 with 31, 6 with 30, 7 with 29 and 8 with 30 ...