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(6 ways for math 7 ways for science 3 combinations of subjects) + (6 ways for math 4 ways for economics 3 combinations of subjects)
(6 ways for math 7 ways for science 3 combinations of subjects) + (6 ways for math 4 ways for economics 3 combinations of subjects) + (7 ways for science 4 ways for economics 3 combinations of subjects) = 126 + 72 + 84 = 282 ways." What does this part mean
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