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DLMD
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Set A contains positive integers from 101 to 500, inclusive. 31 May 2005, 20:43
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Set A contains positive integers from 101 to 500, inclusive. What is the probability that a number N, which first digit is 1,2, or 3 and last digit is 4, 5, or 6, can be selected randomly?



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Set A contains positive integers from 101 to 500, inclusive. 01 Jun 2005, 11:44
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I assume that you're talking about a 3 digit number from the set that satisfies the abovementioned criterion.

Of 400 numbers, 90 (3x3x10) satisfy this criterion. Hence probability = 9/40.
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Set A contains positive integers from 101 to 500, inclusive. 01 Jun 2005, 12:20
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I get 90/399....

I dont think we have 400 numbers?
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Set A contains positive integers from 101 to 500, inclusive. 01 Jun 2005, 17:07
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I got 9/40 as well.

I believe the forumla for a range of numbers which is inclusive on both sides =

(x1-x2) + 1

Could be wrong though.
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Set A contains positive integers from 101 to 500, inclusive. 03 Jun 2005, 12:26
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DLMD
Set A contains positive integers from 101 to 500, inclusive. What is the probability that a number N, which first digit is 1,2, or 3 and last digit is 4, 5, or 6, can be selected randomly?
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prob of 1,2,3 being first digit = 3/4
prob of 4,5,6 being last digit = 3/10

answer 9/40



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