You are the proud owner of a brand-new Audi Quattro. Unbeknownst to you, the car has a manufacturing defect that causes it to have a 50001 chance of exploding each time you turn it on.
I think there is atyping mistake the chance must be 5000 : 1
P(explode) = 1/5000
P(doesn't explode) = 1 - P(explode)
= 1 - 1/5000
P(doesn't explode) = 4999/5000
(1) P(explode the first time you turn it on) = P(explode) = 1/5000
(2) P(explode the 100th time you turn it on) = P(doesn't explode in first 99 times)*P(explode)
= ((4999/5000)99)*(1/5000)
P(explode the 100th time you turn it on) = 0.00019
(3) P(explode at any point in the first 5000 times) = 1 - P(doesn't explode in first 5000 times)
= 1 - (4999/5000)5000
P(explode at any point in the first 5000 times) = 0.632
(please upvote the solution if u find it satisfactory)
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