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A workplace ID is comprised of 9 digits XXX-XXX-XXX (X being a number from 0-9). Calculate...

A workplace ID is comprised of 9 digits XXX-XXX-XXX (X being a number from 0-9). Calculate the possible ID numbers for the following restrictions:
1) When viewed as an integer, the value of the ID number is greater than or equal to a million
2) No number repeats AND the numbers are in increasing order (The second number must be greater than the first number and the third number greater than the second and first number etc...)

math   Statistics-And-Probability   
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Answer #1

The ho will be less Joo ODD OOD than 1 million only if all of first 3 digits are o. so, favourable ways= (Total-unfavourable)

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