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If a 3-digit integer is selected at random from the [#permalink]
11 Nov 2007, 14:29

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Difficulty:

(N/A)

Question Stats:

72% (02:33) correct
28% (00:44) wrong based on 26 sessions

If a 3-digit integer is selected at random from the
integers 100 through 199, inclusive, what is the
probability that the first digit and the last digit of the
integer are each equal to one more than the middle
digit?

I've got 10 possible numbers 100 1+0 is 1 greater than 0 111 1+1 is 1 greater than 1 122 1+2 is 1 greater than 2 133 ....etc 144 155 166 177 188 199

That gives 10/100. What am I missing???

Here we go...

If a 3-digit integer is selected at random from the
integers 100 through 199, inclusive, what is the
probability that the first digit and the last digit of the integer are each equal to one more than the middle digit?

I´ve done an interview at Accepted.com quite a while ago and if any of you are interested, here is the link . I´m through my preparation of my second...

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