If f={ (5,1), (6,2), (7,3), (8,1), (9,7) }, then the range of F is ...

A - { (1,5), (2,6), (3,7), (1,8), (7,9) }

B - {1, 2, 3, 7}

C - {5, 6, 7, 8, 9}

What is the answer to 2c-4d

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