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In a (6)-place binary string only (0) and (1) are used. The first and last places must be (1). How many strings are possible?

Answer and explanation

Correct answer: (16) स्ट्रिंग

The governing concept is the multiplication principle with fixed positions. A six-place binary string has positions 1 through 6. The first position is forced to be 1, and the sixth position is also forced to be 1, so neither contributes a choice. The four middle positions, 2 through 5, may independently contain either 0 or 1, giving 2 choices for each. Therefore the total number is 2 × 2 × 2 × 2 = 2^4 = 16. Option A is correct. Option B counts five free positions, option C incorrectly treats the restrictions as reducing the count too far, and option D counts all six positions as unrestricted.

Related tags

Fundamental-Principle-Of-CountingBinary-StringsRestricted-ArrangementsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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