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Question

In tossing a coin, the chance of throwing head and tail alternatively in 3 successive trials is


A
18
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B
16
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C
15
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D
14
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Solution

The correct option is C $$\displaystyle \frac{1}{4}$$
Total sample space is $$HHH, HHT, HTH, HTT, THH, THT, TTH, TTT i.e., 8$$.
Here, head and tail alternatively occurs in $$2$$ occasions only.

Therefore, probability will be
$$=\dfrac{2}{8}$$
$$=\dfrac{1}{4}$$

Hence, this is the answer.

Mathematics

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