**Solution:**

(i) Winning of Geeta is a complementary event to winning of Ritu

Thus,

P(winning of Ritu) + P(winning of Geeta) = 1

P(winning of Geeta) = 1 – P(winning of Ritu)

P(winning of Geeta) = 1 – 0.73

P(winning of Geeta) = 0.27

(ii) Not winning of Ritu is a complementary event to winning of Ritu

Thus,

P(winning of Ritu) + P(not winning of Ritu) = 1

P(not winning of Ritu) = 1 – P(winning of Ritu)

P(not winning of Ritu) = 1 – 0.73

P(not winning of Ritu) = 0.27