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Dafna11
[192]
3 years ago
6
An identity thief watches someone enter a 4-digit PIN and manages to see the first two digits. If the thief tries guessing the P
IN, how many possibilities would there be?
a.
81
b.
90
c.
100
d.
200
Mathematics
Answer
Comment
Send
2
answers:
DENIUS
[597]
3 years ago
7
0
Think of it this way: your friend is thinking of a year, and you have to guess which. She has told you the year is in the 20th century (1900s).
There are 100 years in the 20th century (1901-1999 plus 1900).
There can be 100 possibilities
Send
Setler
[38]
3 years ago
3
0
100 combinations can be formed from the last two digits. So the answer is (c).
Send
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