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Simplify 93n+13n+23n+13n...

Simplify 93n+13n+23n+13n

A.

3

B.

9

C.

27

D.

81

Correct answer is B

93n+13n+23n+13n

= 3n3n3132323n313n

3n(3231)3n(311)

27931

182

= 9