Answer:
1/78
Step-by-step explanation:
6 brown + 5 blue + 2 orange marbles = 13 marbles
P (orange1) = number of orange / total
= 2/ 13
Now we keep the marble
6 brown + 5 blue + 1 orange marbles = 12 marbles
P (orange2) = number of orange / total
= 1/ 12
P (orange, keep, orange) =P(orange1) + P( orange2)
2/13*1/12 = 2/156 = 1/78
