Search found 23 matches

by atiab jobayer
Sun Dec 07, 2014 10:34 am
Forum: Test Forum
Topic: Cox's Bazar+ Patuakhali BdMO 2014: Junior 8
Replies: 1
Views: 3804

Cox's Bazar+ Patuakhali BdMO 2014: Junior 8

∠BAC is a right angle, ADB, AEC, ABC are semicircles with diameters AB, AC and BC. The areas of the black portions in semicircles ADB and AEC are 13 and 16 respectively. Find the area of triangle ABC.
by atiab jobayer
Sun Dec 07, 2014 9:41 am
Forum: Test Forum
Topic: Chittagong BdMO 2014: Junior 6
Replies: 1
Views: 2820

Chittagong BdMO 2014: Junior 6

Kona has a number, 92154576. She defines numbers divisible by 5 as Magic Numbers. She wants to turn the number she has into a Magic Number. For this she may only remove some, but not all, of the digits from the number. In how many ways can she do this? :roll:
by atiab jobayer
Fri Dec 05, 2014 10:46 am
Forum: Test Forum
Topic: Chittagong BdMO 2014: Juior 9
Replies: 2
Views: 3208

Chittagong BdMO 2014: Juior 9

How many six digit integers can be formed so that the number formed by the first, second and fourth digits (counting from left) as well as the other number formed by the third, fifth and sixth digits is divisible by 11? It is required that the third and fourth digits are different
by atiab jobayer
Thu Dec 04, 2014 10:46 am
Forum: Test Forum
Topic: Bdmo National2014: junior 5
Replies: 2
Views: 3399

Re: Bdmo National2014: junior 5

Yes. I've made a solution. I agree with Labib.In the new series, there must be contain 20 term. The missing numbers are : 2,6,8,10,14,18,22,24,26,30.
And the new wanted series is : 1,3,4,5,7,9,11,12,13,15,16,17,19,20,21,23,25,27,28,29.
by atiab jobayer
Thu Dec 04, 2014 10:30 am
Forum: National Math Olympiad (BdMO)
Topic: BdMO national 2014: junior 8
Replies: 9
Views: 4208

Re: BdMO national 2014: junior 8

Hasibul Haque Himel. wrote:ভাই আপনে প্রশ্ন দিয়েছেন ৮ নুম্বের। কিন্ত চিত্র দিয়েছেন ৭ নাম্বারের।


Where have you find picture? :roll: there is no picture as attachment. If you can do the solution. :evil:
by atiab jobayer
Thu Dec 04, 2014 10:24 am
Forum: National Math Olympiad (BdMO)
Topic: BdMO National 2013: Primary 2, Junior 1
Replies: 10
Views: 5557

Re: BdMO National 2013: Primary 2, Junior 1

*Mahi* wrote:Please do not use red color in general posts in forum, as it is generally associated and can be confused with warnings or notices.

But Mahi, I've used blue colour. Not RED.
by atiab jobayer
Mon Dec 01, 2014 11:21 am
Forum: National Math Olympiad (BdMO)
Topic: BdMO national 2014: junior 8
Replies: 9
Views: 4208

BdMO national 2014: junior 8

AVIK is a square. The point E is taken on VK in such a way that 3VE=EK. F is the midpoint of AK. What is the value of <FEI?
by atiab jobayer
Fri Apr 18, 2014 11:13 pm
Forum: Test Forum
Topic: DMO 2012: gopalgonj 3
Replies: 1
Views: 2978

DMO 2012: gopalgonj 3

What is the largest number whose digits are distinct prime numbers?
by atiab jobayer
Fri Apr 18, 2014 11:09 pm
Forum: Test Forum
Topic: DMO 2012: gopalgonj 2
Replies: 1
Views: 3136

DMO 2012: gopalgonj 2

If a number remains unchanged when reversed, it is called a palindrome. 33, 23432, 191 are examples of palindromes. What is the minimum possible sum of the digits of a five digit palindrome?
by atiab jobayer
Sun Feb 23, 2014 11:28 pm
Forum: Test Forum
Topic: Bdmo national 2014: junior 09
Replies: 4
Views: 4174

Bdmo national 2014: junior 09

If N is an even integer , prove that 48 divides N(N^2+20).