What is the worst case number of combinations he must now


Question: A thief walks up to an electronic lock with a 10-digit keypad and he noticed that all but three of the keys are covered in dust while the 2, 4 , 6 and 8 keys show considerable wear.

He thus can safely assume that the 4-digt code that opens the door must be made up of this number in some order.

Problem: What is the worst case number of combinations he must now test to try open this using a brute-force attack?               

Can you answer this problem using basic computer networking concepts and securities.

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Computer Network Security: What is the worst case number of combinations he must now
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