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How many binary strings of length (7) have exactly (4) zeros and no occurrence of (3) consecutive zeros?

Answer and explanation

Correct answer: (19)

Place the (4) zeros in the (4) gaps around the (3) ones, with no gap receiving more than (2) zeros. Control forbidden consecutiveness by gap limits.

Related tags

Binary-StringsGap-MethodZerosFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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