Which concept involves counting each object in a one-to-one ratio?

Which concept involves counting each object in a one-to-one ratio?

• A. Factorial counting
• B. Complementary counting
• C. Exponential counting
• D. Sequential counting

Answer: (D)

Counting each object in a one-to-one ratio means going through the items and assigning a unique number to each one as you encounter it—1 to the first item, 2 to the next, and so on—so every item is counted exactly once. This is why sequential counting is the right description: it counts in order, ensuring a direct one-to-one link between objects and counting numbers. This method guarantees no item is skipped and no item is counted more than once, which is the essential idea when you need a precise total. Other approaches focus on different ideas—such as arranging items in all possible orders or using the total count minus what you don’t need—rather than simply pairing each object with a unique count in sequence.