1.

If aa and bb are positive integers, and x=2 3 7 ax=2 3 7 a , and y=2 2 8 by=2 2 8 b , and the values of both xx and yy lie between 120 and 130 (not including the two), then a b=a b=

A. -2
B. -1
C. 1
D. 2
Answer» C. 1


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