This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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40$$
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Exercice 1, Consigne 1:
Step 1: Justifier la première équation du système. L'effectif total des candidats est de 40. La somme des effectifs dans le tableau doit être égale à l'effectif total. Ceci justifie la première équation du système.
**Step 2: Justifier la
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Welcome back b6997168 — been a while! Let's pick up where you left off. Exercice 1, Consigne 1: Step 1: Justifier la première équation du système.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.