A three-digit code for certain locks uses the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 according to the following constraints. The first digit cannot be 0 or 1, the second digit must be 0 or 1, and the second and third digits cannot both be 0 in the same code. How many different codes are possible?

152.

Explanation:

The first digit can be filled in 8 ways

For second digit , it can either be 0 or 1

Case 1 -

If second digit is 1 ,Third digit can take 10 values

number of codes = 8 * 1 * 10 = 80

Case 2 -

If second digit is 0,Third digit can take 9 values ( Third digit can't be zero)

number of codes = 8 * 1 * 9= 72

Total number of codes = 152

answer; i believe the correct answer is network?

the printer can be used in a both wired and wireless network, only one of the connection methods can be used at one time when the wireless setting is enabled, the wired (ethernet) setting is disabled.

but first you need to

`connect the cord to your computer

`open settings app from the start menu

`click devices

`than click add printer or scanner

and than you should be able to do it from there, if not let me know i can you! : )