2/6, but it can be reduced to 1/3
Answer:
<em>Probability ≈ 0.3571</em>
Step-by-step explanation:
Consider the steps below;

<em>Solution; Probability ≈ 0.3571</em>
1 I think not too sure tho
4n/5-4/7=64/35
4n/5-20/35=64/35
4n/5=84/35
4n=12
n=3. Hope it help!