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What is the next number in the pattern below?
#97frac{1}{2},80frac{1}{2},67frac{1}{2},56frac{1}{2}#,_____
A. #39frac{1}{2}#

B. #47frac{1}{2}#

C. #49frac{1}{2}#

D. #63frac{1}{2}#