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How many integers n are there such that r < n < s? (1)

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How many integers n are there such that r < n < s? (1) [#permalink] New post 17 Jun 2006, 10:14
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How many integers n are there such that
r < n < s?
(1) s – r = 5
(2) r and s are not integers.
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 [#permalink] New post 17 Jun 2006, 11:11
C?

1. s-r = 5
s = 7, r =2
=> n = 3,4,5,6 --> 4 such possibilites
s = 7.5, r = 2.5
=> n = 3,4,5,6,7 --> 5 such possibilities
INSUFF.

2. r & s integers. No relationship specified. INSUFF.

Combine. SUFF. n will have 5 values
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 [#permalink] New post 17 Jun 2006, 11:13
C.

#1. s - r = 5

s = 6, r = 1 => four integers in b/w
s = -1, r = -6 => four integers in b/w
s = 6.5, r = 1.5 => five integers in b/w {2, 3, 4, 5, 6}
Insufficient

#2. r and s are not integers.
Insufficient

Combining #1 and #2 makes it 5 integers. Sufficient.

Messed up the first post... edited now.
  [#permalink] 17 Jun 2006, 11:13
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How many integers n are there such that r < n < s? (1)

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