Test Index

Probability

Question : 38 of 127

Marks: +1, -0

Solution:

Concept:

Probability of at least one tail = 1 – probability of no tails (two heads).

Explanation:

Total possible outcomes for two unbiased coin tosses: HH, HT, TH, TT (4 equally likely outcomes).

The event "at least one tail" includes HT, TH, TT (3 outcomes).

Probability =

\frac{3}{4} = 0.75

Answer:

0.75

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