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Problem

[[0,0,2,1],[1,0,1,0],[0,1,−2,0],[0,0,0,1]]

Solution

1. Identify the task as finding the sum of the elements within the given matrix.

2. Sum the elements of the first row: 0 + 0 + 2 + 1 = 3$.

3. Sum the elements of the second row: 1 + 0 + 1 + 0 = 2$.

4. Sum the elements of the third row: 0 + 1 + (-2) + 0 = -1$.

5. Sum the elements of the fourth row: 0 + 0 + 0 + 1 = 1$.

6. Calculate the total sum by adding the row results together: 3 + 2 + (-1) + 1 = 5$.

Final Answer

(∑_^)((a_i,j))=5

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