Let us assume that we are allowed to print so called college money used for shopping only within campus. the money is composed a unique serial numbers like m20130bc. it always starts with m, follows with five digital numbers chosen from 0 to 9, and then two letters chosen from a to z. a. what is the total number of such series numbers? b. what is the probability of getting the serial number mmm? c. what is the probability of getting a serial number whose last two letters to be aa?

a. 67600000

b. 0.0001396

c. 0.001479

Step-by-step explanation:

a. Since it is a permutation with repetition the formula is:

Where is the number of optionss, here you will use and , one for the numbers and the other for the letters. The exponent corresponds to how many times you have to choose a number (5 times) or a letter (two times because the first letter is always the same), then:

b. The probability of getting that exactly serial number is 1 divided by the total of possibilities:

C. The probability is the number of serials ending with AA divided by the total. The serial ending with AA can have any numbers then   and

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step-by-step explanation: