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Question: hi everyone please use simple maths to help me understand...

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Hi everyone,

 

Please use simple maths to help me understand the following:

Imagine that you live in an area where floods occur on average every 10 years. You are considering whether to live in your house for a few more years and save up money or whether to move before you lose everything you own in the next flood.

I calculated P(no flood) in area in next 2 years correctly -> (9/10)(9/10) =0.81

need help with next question:

b) What is the probability that there will be exactly one flood in your area over the course of next two years? Answer in book is 0.18

Please show me the working with simple maths

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