# Chapter 11: separate solutions

## Question 1

Express default regret through counts.

0.3 times the number of pulls of arm 0.

## Question 2

Does common pull cost change arm pseudo-regret?

No; identical cost cancels in the expected-reward comparison.

## Question 3

Express transfer regret.

The best transfer mean is 0.8, so each pull of arm 0 costs 0.8-0.2=0.6 and each pull of arm 1 costs 0.8-0.5=0.3. Regret is 0.6*n0+0.3*n1, where n0 and n1 count pulls of arms 0 and 1; pulls of the best arm add none.