The probability that the arrow will land on any of them <em>once</em> is 1/4.
The probability that the arrow will land on any of them <em>twice</em> is 1/4 * 1/4. This is because the probability of Event A <em>and</em> Event B is P(B) * P(A).
Based on this:

1/256
Hope this helps, let me know if I missed anything!
Answer:
Use ur brain and a calculator
Step-by-step explanation: Install a calculator on ur laptop. Put ur thinking cap on. :) Hope this helps!
Answer:
Step-by-step explanation:
1.80 + 1.05 = 2.85
3.00 - 2.85 = .15 inches