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Simplify 1(13)2...

Simplify 1(13)2

A.

1123

B.

1+123

C.

3

D.

1+3

Correct answer is B

1(13)2 

(13)2=(13)(13)

123+3=423

1423

After rationalising (multiplying the denominator and numerator with 4+23, we have

4+234=1+123