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In a (2)-place signal the first place can have (9) colors and the second place can have (7) shapes. How many signals are possible?

Answer and explanation

Correct answer: 63

There are 9 choices for the first place. For each chosen colour, any one of 7 shapes can be used in the second place. Therefore, by the fundamental principle of counting, the total number of signals is \(9 \times 7=63\). Option 16 comes from adding \(9+7\), but independent choices made in successive places are multiplied, not added. Exam tip: Multiply the numbers of choices when a result is formed through consecutive selection steps.

Related tags

Fundamental Principle Of CountingMultiplication PrinciplePermutations And CombinationsClass 11 MathematicsCounting SignalsMathematicsClass 11 Mcq

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