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less than 2 min. ans: 9 7-14-25-28-35-50-70-100-140
Paul: I made up this question. I'm not sure if my wording is correct!
My question is to find all factors for both numbers with out double
counting. If my original question did not convey that meaning,
please reword the question!
140 has 12 distinct factors, 100 has 9 distinct factors, they both have 6 factors in common so the total number of distinct factors should be 21-6=15
GamtBlast: BG has given the correct explanation.
To understand it further, consider two small numbers, such as 10 and 6.
Well, what I found is the total distinct factors common to 100 and 140.
I believe when the word "both" is used in the problem, it is safe to assume that we are being asked for the factors common to 100 and 140. But anyhow I think the problem here was looking for union of factors of 100 and 140. The word "both" is misleading. Thanks
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