Choosing one question from each of three exercises: A test picks one question each from Exercise 7 (12 questions), Exercise 8 (18 questions), and Exercise 9 (9 questions). In how many ways can the three-question paper be formed?

Introduction / Context:
Selecting one item from each of several independent pools uses the multiplication principle. Here we choose one question from each of three exercises with given counts.

Given Data / Assumptions:

• Exercise 7 has 12 questions.
• Exercise 8 has 18 questions.
• Exercise 9 has 9 questions.
• Choices are independent.

Concept / Approach:

• Total papers = 12 * 18 * 9.

Step-by-Step Solution:

Verification / Alternative check:
No overlaps or constraints exist, so simple multiplication applies directly.

Why Other Options Are Wrong:

• 2094, 1894, 2194 are arithmetic distractors, not equal to 12*18*9.

Common Pitfalls:

• Adding the counts instead of multiplying across independent choices.

Final Answer:
1944