Flies are tested for the ability to learn to fly toward the smell of potato, and the

Question:

Flies are tested for the ability to learn to fly toward the smell of potato, and the first to succeed is the 13th. Compare with the likelihood of q = 0.1.
Find the likelihood as a function of the parameter q of a geometric distribution, find the maximum likelihood estimator, and evaluate the likelihood at the maximum and at the other given value of q.