How many integers are there between, but not including

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How many integers are there between, but not including [#permalink]

13 Nov 2008, 03:01

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How many integers are there between, but not including, integers r and s ?

(1) s - r = 10
(2) There are 9 integers between, but not including, r + 1 and s + 1.

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Re: Property of Numbers [#permalink]

13 Nov 2008, 03:05

(1) s - r = 10 => the number of the integer between but not include = 9

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Re: Property of Numbers [#permalink]

13 Nov 2008, 13:15

yhc25 wrote:

I am confused by the explanation of OG(11th ed) to Q61 in Data Sufficiency on p282.

Q60.
How many integers are there between, but not including, integers r and s?
(1) s - r = 10
(2) There are 9 integers between, but not including r + 1 and s + 1.

I understand that (2) is sufficient, but I don't know why (1) is also sufficient.

The question doesn't say anything about whether all integers between r and s are different or whether they can be repeated. If they can be repeated, there can be more than 9 integers within the range of r and s.

Could anyone please help?

We have selected 2 numbers at random r and s and question clearly says integers between, hence the question of repeating does not arise.

Re: Property of Numbers [#permalink] 13 Nov 2008, 13:15

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How many integers are there between, but not including

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How many integers are there between, but not including

How many integers are there between, but not including

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