Seven chits are numbered 1 to 7. Four chits are drawn one by one with replacment. The probability that the least number appearing on any selected chit is 5 is :

Options

A. `((3)/(7))^(4)`
B. `((6)/(7))^(3)`
C. `(5.4.3)/(7^(3))`
D. `((3)/(4))^(3)`

Answer

A

Explanation

The probability that the number appearing on the selected chit is greater than or equal to 5 is 3/7.
`therefore` Required probability `= (3//7)^(4)`