The departure lounge at an airport has ten seats altogether, five on each side. In how...

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Advance Math

The departure lounge at an airport has ten seats altogether,five on each side. In how many different ways can 4 doctors and 6nurses sit if

a) they alternate such that no two doctors sit next to eachother? [3]

b) the doctors enter the lounge first and occupy the four cornerseats and the nurses then follow them and occupy the remainingseats? (4)

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