GRE
\sqrt{( 10^{2m} )( 10^{2n} )}
10^{mn}
(-1)^{n}(-1)^{n+2}
1
The remainder when the sum of 1999^{m} and 2001^{m} divided by 7
4
xy
x+y
The standard deviation of the 30 ratingss
17
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