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BdMO Online Forum • View topic - Dhaka Junior 2011/5

Dhaka Junior 2011/5

Problem for Junior Group from Divisional Mathematical Olympiad will be solved here.
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Dhaka Junior 2011/5

Post Number:#1  Unread postby Moon » Wed Feb 02, 2011 8:23 am

5. A palindrome, such as $83438$, is a number that remains the same when its digits are reversed. How many four digit numbers are not palindromes?
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Re: Dhaka Junior 2011/5

Post Number:#2  Unread postby Mehfuj Zahir » Wed Feb 02, 2011 3:21 pm

Four digit palindrome number should be like ABBA.If u reverse it u will get also ABBA.At first we will count how many numbers are palindrome.It is enough to count AB.SO we will get the result 9o.Then the ans 10000-90=9910
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Re: Dhaka Junior 2011/5

Post Number:#3  Unread postby surjo » Mon Dec 31, 2012 8:41 pm

I did not get it. 9*9=81 should be palindromic numbers
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Re: Dhaka Junior 2011/5

Post Number:#4  Unread postby Shafin » Mon Jan 14, 2013 8:02 pm

Mehfuj Zahir wrote:Four digit palindrome number should be like ABBA.If u reverse it u will get also ABBA.At first we will count how many numbers are palindrome.It is enough to count AB.SO we will get the result 9o.Then the ans 10000-90=9910


4 digit number starts from 1000 so
there are 9000 4 digit numbers therefore the answer should be 8910
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Re: Dhaka Junior 2011/5

Post Number:#5  Unread postby abrarfiaz » Sat Nov 18, 2017 7:50 pm

it will be 90
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Re: Dhaka Junior 2011/5

Post Number:#6  Unread postby abrarfiaz » Sat Nov 18, 2017 7:52 pm

surjo wrote:I did not get it. 9*9=81 should be palindromic numbers




mate it will be 9 * 10
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