Question

A personal identification code consists of five digits (0 through 9). how many codes are possible?
a. 50
b. 252
c. 100,000
d. 30,240

Answer 1

The answer is C, 
on each place you have 10 possible digit,
so for 5 places it will be 10^5 = 100, 000

Answer 2

Since it is a simple probability question,

just do 10 to the power of 5


which equal 100,000