1.Your Username for your company computer is three letters followed by five single digit numbers. The...

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1.Your Username for your company computer is three lettersfollowed by five single digit numbers. The Letters can be repeatedbut the digits cannot be repeated. Find total possible number ofusernames for your company"s computer system.
2.If a pair of fair dice is rolled find following probabilitythat a number other than seven or eleven is rolled such that it isgiven that one of the two die is a two or a four.?
3.It is estimated that 2% pregnancies are the result of in vitrofertilization. The chance of multiple births from in vitrofertilization is 48%. The chance of multiple births from normalmethods is 3%.
a) What is the probability a couple used in vitro fertilizationand it resulted in a non-multiple birth?
b) If a multiple birth did not occur, what is the probabilitythat it is the result of normal methods?

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1There are 26 different letters and 10 different digitsEach letter can be selected in 26 ways Since digit cannot berepeated so first digit can be repeated in 10 ways second in 9ways third in 8 ways and so See Answer

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