A set {1,2,3,4,5,6}. select 2 numbers from the set, is the : DS Archive
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# A set {1,2,3,4,5,6}. select 2 numbers from the set, is the

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A set {1,2,3,4,5,6}. select 2 numbers from the set, is the [#permalink]

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17 Mar 2006, 08:33
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A set {1,2,3,4,5,6}. select 2 numbers from the set, is the sum of the 2 numbers divisible by 4?

a) the larger number selected is 3 times the smaller one

b) both selected numbers are odd numbers
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Re: DS set and number properties [#permalink]

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17 Mar 2006, 08:56
laxieqv wrote:
A set {1,2,3,4,5,6}. select 2 numbers from the set, is the sum of the 2 numbers divisible by 4?

a) the larger number selected is 3 times the smaller one

b) both selected numbers are odd numbers

a) (1,3) and (2,6) are the only pairs that satisfy (n,3n), and both sums are divisible by 4
SUFFICIENT

b)could be (1,3), (1,5) or (3,5)
INSUFFICIENT

Ans: A
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17 Mar 2006, 11:20
Picking numbers:

Stmnt 1:

1 + 3 = 4 --> divisible by 4
2 + 6 = 8 --> divisible by 4

no other numbers fit in to the criteria. Evidently, stmnt 1 is sufficient.

Stmnt 2:

1 + 3 = 4 --> divisible by 4
3 + 5 = 8 --> divisible by 4
1 + 5 = 6 --> NOT divisible by 4

Stmnt 2 is not sufficient.

17 Mar 2006, 11:20
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