# Chapter 20: separate solutions

## Question 1

Compute default disagreement.

0.51^2-0.3^2=0.1701.

## Question 2

Why can Bob know acknowledgement receipt at zero drops?

The declared model removes every world where the acknowledgement was lost.

## Question 3

Compute transfer agreement.

1-(0.75^3-0.5^3)=0.703125.