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In a (5)-place binary string only (0) and (1) can be written. If the first place must be (1) how many strings are possible?

Answer and explanation

Correct answer: 16

The first position is already fixed as 1, so it has no remaining choice. Each of the other 4 positions can contain either 0 or 1, giving 2 choices per position. By the fundamental principle of counting, the total number of strings is \(2\times2\times2\times2=2^4=16\). The answer would be 32 only if all 5 positions had 2 choices each. Exam tip: first identify fixed positions, then multiply the choices for the remaining independent positions.

Related tags

Binary StringsFundamental Counting PrinciplePermutations And CombinationsClass 11 MathematicsCountingFundamental Principle Of CountingMathematicsClass 11 Mcq

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