[5pt] Question 6. Assume that the probability that a randomly selected household in a certain city rents a house is 0.3. Suppose a researcher randomly surveys households in the city until she finds two rental homes. Let X be the number of households in the city surveyed to find the 2nd rental home. Using the probability mass function of X, find the probability that there will be at least 4 households in the city surveyed to find the 2nd rental home