The triangular dimple on the chin, which is available for both the father and the mother, the child does not know

The triangular dimple on the chin, which is available for both the father and the mother, the child does not know that the presence of a dimple is a dominant feature, and with what probability children with a dimple on the chin can be born.

So the sign of the presence of a dimple is dominant, and in the child it is absent, then the genotypes of both parents (Aa).
Children with genotypes will be born:
AA: Aa: Aa: aa
The first three genotypes indicate the presence of a dimple. Accordingly, children with a dimple can be born with a probability of 75%
Answer: they can be born with a probability of 75%.