\"\"

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Find the number of combinatoins of 9 trucks he moving help 6 customers.

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\"\"                 (Apply Combination formula)

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\"\"                (Substitute n = 9 and r = 6)

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\"\"                      (Subtract: \"\")

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Expand the factorial: \"\".

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\"\"

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\"\"                                  (Cancel common terms)

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\"\"                                      (Multiply: \"\")

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\"\"                                           (Divide: \"\")\"\"

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There are 84 possible ways to choose the customers.