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number properties

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number properties

by sud21 » Sat Jan 28, 2012 11:08 pm
If x and y are between 1 and 20, inclusive, do x and y have a common prime factor?
1). x=y+1
2). y is odd
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Source: — Data Sufficiency |
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by Jim@StratusPrep » Sun Jan 29, 2012 3:40 pm
Look at the prime factors for the number between 1 and 20

2 --> 2
3 --> 3
4 --> 4
5 --> 5
6 --> 2 and 3
7 --> 7
8 --> 2
9 --> 3
10 --> 2 and 5
11 --> 11
12 --> 2 and 3
13 --> 13
14 --> 2 and 7
15 --> 3 and 5
16 --> 2
17 --> 17
18 --> 2 and 3
19 --> 19

1) No, see above SUFFICIENT
2) no info about A INSUFFICIENT
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