SOLUTION: A curious card-player wrote the numbers 1,2,3,...,50 on fifty cards and spread them out in front of him. First, he flipped all the cards over, so that they were all face down. Next
Algebra ->
Probability-and-statistics
-> SOLUTION: A curious card-player wrote the numbers 1,2,3,...,50 on fifty cards and spread them out in front of him. First, he flipped all the cards over, so that they were all face down. Next
Log On
Question 1106408: A curious card-player wrote the numbers 1,2,3,...,50 on fifty cards and spread them out in front of him. First, he flipped all the cards over, so that they were all face down. Next, he flipped all the cards that had even numbers. Then, he proceeded to flip all the cards with numbers divisible by 3, then 4, 5 and so on up to 50. What is the sum of the numbers on the cards that were left face down at the end? Answer by ikleyn(52884) (Show Source):
