1.

What is the value of \[{{20}^{-3}}\times {{25}^{2}}\times {{20}^{3}}\times {{25}^{-4}}?\]

A.  \[\frac{1}{625}\] 
B.  \[\frac{1}{400}\] 
C.
D.  625
Answer» B.  \[\frac{1}{400}\] 


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