Answer:
The probability is

Explanation:
From the question we are told that
The number of green marbles is

The number of red marbles is

The number of red marbles is

Generally the total number of marbles is mathematically represented as



Generally total number of marbles that are not red is

=>

=>

The probability of the first ball not being red is mathematically represented as

=>

The probability of the second ball not being red is mathematically represented as

=>
(the subtraction is because the marbles where selected without replacement )
=>

The probability that the first two balls is not red is mathematically represented as

=>
=>
The probability of the third ball being red is mathematically represented as
(the subtraction is because the marbles where selected without replacement )

=>

Generally the probability of the first two marble not being red and the third marble being red is mathematically represented as


=>
