GRE Exam Numerical Ability Number System

can u find the biggest number by using four 1's

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GRE Other Question

2, 8, 20, 36, 72, 114, x.
What should be the value of x to complete the sequence?
The sum of the interior angles of any polygon with n sides is 180(n–2) degrees. If the sum of the interior angles of polygon P is three times the sum of the interior angles of quadrilateral Q,how many sides does P have?