Three coins are tossed. Probability of getting all Heads is:

Three coins are tossed. Probability of getting all Heads is:
  1. $\dfrac{1}{2}$
  2. $\dfrac{1}{4}$
  3. $\dfrac{1}{8}$
  4. $\dfrac{3}{8}$

Solution

Total outcomes $= 2^{3} = 8$. Favourable $= \{HHH\}$. $P = \dfrac{1}{8}$.

Asked in: IMO

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