The student ID number is a 7-digit number. Assume all numbers are randomly gener

Question

The student ID number is a 7-digit number. Assume all numbers are randomly generated, and all numbers are equally likely to be generated. (a) How many possible student ID numbers are there? (b) What is the probability of getting the ID number that is all ones, 1111111? (c) How many student ID numbers have 1 as the first digit? (d) What is the probability of getting a student ID number with 1 as the first digit?

Explanation / Answer

a).Possible ID numbers=>10^7=10000000; b).Probability of getting all ones=1/10000000=0.0000001; c)1/10th of the total possible will have 1 as first digit=10000000/10=1000000; d).Probability of above=1000000/10000000=0.1; Maybe I get this right this time:)

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