Mathematics

What is the probability that 3 customers waiting in a bank will be served in…

What is the probability that 3 customers waiting in a bank will be served in the sequence of their arrival at the bank

  • A.
    1/6
  • B.
    1/3
  • C.
    1/2
  • D.
    2/3
  • E.
    5/6
Correct Answer: Option A
Explanation

Probability that 3 customers are attended to in the sequence they arrive 

= prob of attending to the 1st arrival x prob of attending to the second last x prob of attending to the last

= (frac{1}{3} times frac{1}{2} times frac{1}{1})

= (frac{1}{6})