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In Sydney, phone numbers at present consist of eight digits, starting with the digit 9. i....

In Sydney, phone numbers at present consist of eight digits, starting with the digit 9.

i. How many phone numbers are possible?

ii. How many of these end in an odd number?

iii. How many consist of odd digits only?

iv. How many are there that do not contain a zero, and in which the consecutive digits alternate between odd and even?

Please provide full working and correct answer .

Math   Statistics-And-Probability   
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