A function is declared named "multi" and the function has parameter of a, b and c. The default value of b and c are 1.
Locally, we print the product of a, b and c.
Finally, we call the function with its inputted parameters. Notice we only had 2 argument while calling the function. This simply implies that the default value for c is used. Therefore, we will have 2 × 5 × 1 = 10
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