Question

Job interview: Seven people, named Anna, Bob, Chandra, Darlene, Ed, Frank, and Gina, will be interviewed for a job. The interviewer will choose two at random to interview on the first day. What is the probability that Hank is interviewed first and Ed is interviewed second? Express your answer as a fraction or a decimal rounded to four decimal places. The probability that Hank is interviewed first and Ed is interviewed second is

Answer 1

solution:

total number of person = 7

let A be the event that Hank interviewed and B be the event that Ed interviewed

so P(A) = 1/7

P(B | A) = 1/6      (selecting Ed for interview out of 6 after Hank was interviewed first

so required probability = (1/7) * (1/6) = 1/42 = 0.0238