Need an answer showing work thax!

Option (a)

Step-by-step explanation:

The given expression is :

We need to rewrite the sum using sigma notation.

The numerator is 3 in all terms.

At denominator, in first term (1)(2), in second term (2)(3) and so on.

A general term for the denominator is k(k+1).

Sigma notation is :

Hence, the correct option is (A).

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