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Re: How many integers between 324,700 and 458,600 have tens digit 2 and [#permalink]
08 Jul 2010, 11:51

bibha wrote:

How many integers between 324,700 and 458,600 have a 2 in the tens digit and a 1 in the units digit? A 1,339 B 1,352 C 1,353 D 10,030 E 10,300

Find the number of integers between the two.

458600-324700 = 133900. Now we need to figure out how many instances there will be a 2 in the tens and a 1 in the units. The easiest way to do this is to see that per 100 integers (0-100) only 21 suffices the conditions. Thus, per 100 integers there is only 1 instance.

Re: How many integers between 324,700 and 458,600 have tens digit 2 and [#permalink]
19 Apr 2015, 02:37

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Re: How many integers between 324,700 and 458,600 have tens digit 2 and [#permalink]
21 May 2015, 08:19

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