BdMO National Junior 2011/7
Posted: Fri Feb 11, 2011 1:11 pm
Problem 7:
Consider a sequence of four integers so that the GCD of first three is the same as the LCM of the last three. How many such sequences exist so that the sum of the numbers is $2011$?
Consider a sequence of four integers so that the GCD of first three is the same as the LCM of the last three. How many such sequences exist so that the sum of the numbers is $2011$?