A row of circles representing the addition of 1, 2, 3, and 4. It consists of four rows and four columns resembling a lower triangular matrix. Row 1 has a circle. Row 2 has two circles. Row 3 has three circles. Row 4 has four circles.
A row of circles represents the addition of numbers. It consists of four rows and five columns resembling a rectangle. Each row has five circles. It represents a lower triangular matrix and an upper triangular matrix.
The window displays the following program code. Input 1: 2, plus, 2. Output 1: 4. Input 2: 100, minus, 75. Output 2: 25. Input 3: 7, asterisk, 9. Output 3: 63. Input 4: 14, forward slash, forward slash, 2. Output 4: 7. Input 5: 15, forward slash, forward slash, 2, hash, ...
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