GRE
(-1)^{n}(-1)^{n+2}
1
The remainder when 3^{4n} is divided by 10
The radius of the circle
6
The number of lines in the plane that pass through points P, Q and T
The least possible total number of patients that Dr. Bradley treated on the 5 working days last week
110
x
55
The remainder when n is divided by 31
16
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