Homework Answers
9.
the floors in the building are 0 to 59 (0 : ground floor)
for atleast 1 min lift has to be on atleast k th floor
(k-0)*3 sec= 1 minute
3*k sec = 60 sec
k = 20
so, if left is on floor 20 to 59 it will take atleast 1 min
no. of floors in 20 to 59 = 40 floors
P(atleast 1 min) = (no. of floors in 20 to 59)/(total floors)
= 40/60 = 2/3 = 0.6667
P(atleast 1 min) = 0.6667
(please UPVOTE)
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