Kindeep forgot his password, but he knows it is a 3-digit number of which at least one is a 5 and at least one is an 8 and there are no digits other than 5's and 8's. What is the maximum number of different passwords he might have to try to log into his device?
Answers
The answer might be 13 because the
Given : Kindeep forgot his password, but he knows it is a 3-digit number of which at least one is a 5 and at least one is an 8 and there are no digits other than 5's and 8's.
To Find : What is the maximum number of different passwords he might have to try to log into his device?
Solution:
one Digit is 5
Another digit is 8
remaining Digit can be 5 or 8
Case 1 :
2 5's & 1 8's
Number of possible arrangements = 3 as 8 can take any of 3 positions rest are being taken by 5
558
585
855
Case 2 :
1 5's &2 8's
Number of possible arrangements = 3 as 5 can take any of 3 positions rest are being taken by 8
588
858
885
3 + 3 = 6 number of different passwords he might have to try to log into his device
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