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In a (7)-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: (32) strings

This uses the fundamental principle of counting with fixed and free positions. A 7-place binary string has positions 1 through 7. The first position is fixed as 1, and the seventh position is also fixed as 1, so neither contributes a choice. The remaining five positions, 2 through 6, can independently contain either 0 or 1. Thus the number of strings is 2 × 2 × 2 × 2 × 2 = 2⁵ = 32. Therefore, option B is correct. Option C incorrectly treats all six nonfixed positions as free, option D ignores both fixed conditions, and option A counts only four free positions.

Related tags

Binary StringsFundamental Principle Of CountingClass11Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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