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In how many ways can a lift holding eight passenger carry a part of thirteen in two journey?

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13C8+13C7 = 3003

can choose to take 8, 7,6 or 5 passangers on the first journey. then the remaining passangers could confirtably be catered for when he comes back.

so (13C8+13C7+13C6+13C5)

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