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08122010  #1 
Join Date: Aug 2010
Posts: 1

Help with "missing numbers" pattern
Find the missing numbers and explain the pattern:
1. 1,3,__, 15, 25, 75 2. 1,2,7, __, 49, 98 3. 1,2,4,5,10,20,25,__,100 4. 1,2,3,4,6,8,12,__,24,48 
08132010  #2  
Join Date: Dec 2008
Posts: 249

Quote:
These are lists of factors. 1. Factors of 75: 1, 3, 5, 15, 25, 75 2. Factors of 98: 1, 2, 7, 14, 49, 98 3. Factors of 100: 1, 2, 4, 5, 10, 20, 25, 50 , 100 4. Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 

08272010  #3  
Join Date: Feb 2010
Posts: 388

Quote:
Factors of 75: 1, 3, 5, 15, 25, 75. Factors of 98: 1, 2, 7, 14, 49, 98 Factors of 100: 1, 2, 4, 5, 10, 20, 25, 50 , 100 Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 These are the Factors not really tha complicated but not that easy either.
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09222010  #4 
Join Date: Mar 2010
Posts: 46

agree with MAs1

11302010  #5 
Join Date: Oct 2010
Posts: 8


11302010  #6  
Join Date: Nov 2010
Posts: 36

Quote:
Bye the way does Mas1 or anyone else have a good way to approach series in general? Ie a systematic approach for people like me who tend to get stuck / frustrated with series. Many thanks in advance folks! 

11302010  #7 
Join Date: Dec 2009
Posts: 38

these are really good problems
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11302010  #8 
Join Date: Nov 2010
Posts: 4

agree
i no right

12032010  #9 
Join Date: Oct 2010
Posts: 8

yep

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