In a throw of a coin, the probability of getting a head

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In a throw of a coin, the probability of getting a head is ?

1. 1/2
2. 1/4
3. 1
4. None of these

Correct Option: A

Here S = {H, T}
and E = {H}
∴ P(E) = n(E)/n(S) = 1/2