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A 4-place signal is formed as follows: the first place is chosen from 5 colors, the second and third places use different shapes chosen from 6 shapes, and the fourth place is chosen from 4 icons. How many signals are possible?

Answer and explanation

Correct answer: 600 signals

The first place has 5 choices. The second and third places must use different shapes, giving 6 × 5 choices. The fourth place has 4 choices. Thus, the total is 5 × 6 × 5 × 4 = 600 signals.

Related tags

Counting PrincipleMultiplication RuleFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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