(Q13) Is getting a head complementary to getting a tail? Give reasons.

Answer :

Number of outcomes favourable to head =

Probability of getting a head =
[P(E)]

Number of outcomes not favourable to head =

Probability of not getting a head =
[P(Ē)]
Now P(E) + P(Ē) =
+
=

∴ Getting a head is complementary to getting a tail.