Instructions

In the following Questions a sequence of numbers and letters that follow a definite pattern is given. Each question has a blank space. This blank space is to be filled by the correct answer from one of the four given options to complete the sequence without breaking the pattern.

Question 28

$$\frac{n(n + 1)}{2} : \sum n :: ....... : \sum n^2$$

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$$\frac{n(n + 1)}{2} : \sum n :: ....... : \sum n^2$$

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