After saying goodbye to their friends, Chris decided to drop by the mall to buy new phone for Marie. While they are choosing a handset, the sales lady told them that could also choose the last 6 digits of the mobile number that they are going to buy. If they could only choose from 1 to 9 and the number could only be chosen once, how many mobile numbers are available to them if
a. they want the digits of their anniversary date, 17, to be included (not necessarily the exact date)?
b. they want the digits of their birthday, 9 and 5, to appear together in the last 6 digits?
thanks so much to those who will answer... im just so confused.. thanks so much.. really....
a. they want the digits of their anniversary date, 17, to be included (not necessarily the exact date)?
b. they want the digits of their birthday, 9 and 5, to appear together in the last 6 digits?
thanks so much to those who will answer... im just so confused.. thanks so much.. really....