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,
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Question 1189471: 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(52846) (Show Source): You can put this solution on YOUR website!
.
This problem was solved at the forum several years ago by tutor @KMST.
See the link
https://www.algebra.com/algebra/homework/word/geometry/Geometry_Word_Problems.faq.question.1105590.html
https://www.algebra.com/algebra/homework/word/geometry/Geometry_Word_Problems.faq.question.1105590.html
She shown that the selected numbers are all the perfect squares between 1 and 50 inclusive 1, 4, 9, 16, 25, 36, 49,
so their sum is 1 + 4 + 9 + 16 + 25 + 36 + 49 = 140. ANSWER
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