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A secure code has (6) binary positions. No three consecutive positions can be (1). How many codes are possible?

Answer and explanation

Correct answer: (44)

Subtract the cases containing three consecutive (1)'s from total (2^6) by organized counting. For short strings, position-based counting is reliable.

Related tags

PermutationsCombinationsCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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