During a tight job market, recruiters have noticed that graduating seniors with an intermediate proficiency in a second language have a higher probability of getting a first interview following a screening call when seeking their first job out of college. For students with one language, the probability of getting a first interview following a screening call is 0.25, whereas for graduating seniors with a second language the probability is 0.35. Let be the number of screening calls a graduating senior with an intermediate proficiency in a second language must take up to and including getting their first interview.

Q: What is the exact probability that a graduating senior with an intermediate proficiency in a second language must have at least four screening calls to get their first interview? Write down the formula you would use with numbers substituted but use R to calculate the answer. Copy and paste your R code here with the answer from R.