An identity thief watches someone enter a 4-digit pin and manages to see the first two digits. if the thief tries guessing the pin, how many possibilities would there be?
a.
81
b.
90
c.
100
d.
200

Answer: c. 100

Step-by-step explanation:

Given: An identity thief watches someone enter a 4-digit PIN and manages to see the first two digits.

If the thief tries guessing the PIN, then he need to guess the the last two digits of the 4-digit PIN such that there is 10 possibilities for each place.

Now, the number of possibilities for the last two digits =

Hence, If the thief tries guessing the PIN, the number of possibilities for the last two digits =100