A child attempts to open a five-disc
lock, each disc having digits 0 to 9. He
takes 5 sec to...
Mathematics, 25.01.2021 14:00 Deagon4434
A child attempts to open a five-disc
lock, each disc having digits 0 to 9. He
takes 5 sec to dial a particular
number on the disc. If he does so for
5 hrs everyday, the number of days in
which he would be sure to open the
lock will be (Assume that he does not
repeat the number he has tried
earlier.)
A
30
B
28
C
27
Answers: 3
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