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nadia-polikarpova · May 10, 2024 · 1d9a502 · 1d9a502
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diff --git a/docs/lectures/04-hof.html b/docs/lectures/04-hof.html
@@ -816,7 +816,7 @@ <h2 id="quiz-2">QUIZ</h2>
 <p><strong>B.</strong> <code class="sourceCode haskell">len <span class="ot">=</span> <span class="fu">foldr</span> (\n m <span class="ot">-&gt;</span> n <span class="op">+</span> m) <span class="dv">0</span></code></p>
 <p><strong>C.</strong> <code class="sourceCode haskell">len <span class="ot">=</span> <span class="fu">foldr</span> (\_ n <span class="ot">-&gt;</span> n <span class="op">+</span> <span class="dv">1</span>) <span class="dv">0</span></code></p>
 <p><strong>D.</strong> <code class="sourceCode haskell">len <span class="ot">=</span> <span class="fu">foldr</span> (\x xs <span class="ot">-&gt;</span> <span class="dv">1</span> <span class="op">+</span> len xs) <span class="dv">0</span></code></p>
-<p><strong>E.</strong> All of the above</p>
+<p><strong>E.</strong> None of the above</p>
 <p><strong>HINT</strong>: remember that <code class="sourceCode haskell"><span class="fu">foldr</span><span class="ot"> ::</span> (a <span class="ot">-&gt;</span> b <span class="ot">-&gt;</span> b) <span class="ot">-&gt;</span> b <span class="ot">-&gt;</span> [a] <span class="ot">-&gt;</span> b</code>!</p>
 <p><br>
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diff --git a/lectures/04-hof.md b/lectures/04-hof.md
@@ -826,7 +826,7 @@ Which of these is a valid implementation of `len`
 
 **D.** `len = foldr (\x xs -> 1 + len xs) 0`
 
-**E.** All of the above
+**E.** None of the above
 
 **HINT**: remember that `foldr :: (a -> b -> b) -> b -> [a] -> b`!