Question 252181
Binomial expansion: (a+b)^10=a^10+10a^9b+45a^8b^2+... This is the only part of the expansion that we need.
Let a=.8, b=.2
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No car returned: .8^10=.107
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Exactly 2 returned: 45*.8^8*.2^2=.302
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At least 2 returned:
10*.8^9*.2=.268 (exactly 1 returned)
1-.107-.268=.624 (1-one or none returned)
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Ed