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A security card has a row of (3) symbols. Each position can be filled with one of (6) symbols, but all three symbols must not be identical. How many cards are possible?

Answer and explanation

Correct answer: (6^3-6=210)

From all (6^3) rows, subtract the (6) rows where all three are identical. With a single prohibition, the complement method is quick.

Related tags

CountingSymbolsComplementFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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