2_b_1: Add solution

2 files changed, 18 insertions, 1 deletions

diff --git a/README.md b/README.md
index c2f8d5d..743333c 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ more visible in the list the first exercise of a group is in bold italics.
 | 1_a_3          | yes    |      | |
 | 1_a_4          | yes    |      | |
 | **_2_a_1_**    | yes    | 25   | 2. Types and functions |
-| **_2_b_1_**    |        | 39   | |
+| **_2_b_1_**    | yes    | 39   | |
 | 2_b_2          |        |      | |
 | 2_b_3          |        |      | |
 | **_3_a_1_**    |        | 60   | 3. Defining types, streamlining functions |
diff --git a/ch02/2_b_1.txt b/ch02/2_b_1.txt
new file mode 100644
index 0000000..839e172
--- /dev/null
+++ b/ch02/2_b_1.txt
@@ -0,0 +1,17 @@
+-- Haskell provides a standard function, last :: [a] -> a, that returns the last
+-- element of a list. From reading the type alone, what are the possible valid
+-- behaviours (omitting crashes and infinite loops) that this function could
+-- have? What are a few things that this function clearly cannot do?
+
+-- Possible valid behaviours could be
+--   - returning the first element of the list
+--   - returning an element in the middle of the list
+--   - returning the last element of the list
+--   ...
+
+-- This function clearly cannot
+--   - return an element of the list at a specified index because it has just
+--     one parameter
+--   - return a sublist of the list
+--   - be an identity function (return its argument)
+--   ...