Problems/Counting unique/task.html

<b>Counting unique</b> <a class=right href="https://hyperskill.org/learn/step/6649">Open on JetBrains Academy</a>
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  <p>Imagine you have information about subjects three students study. It could be in the following format:</p> 
  <pre><code class="language-python">Belov = ["Physics", "Math", "Russian"]
Smith = ["Math", "Geometry", "English"]
Sarada = ["Japanese", "Math", "Physics"]</code></pre> 
  <p>The subjects can be the same or differ. Your task is to find the number of <em>unique </em>subjects. For example, in the lists above we have 6 different subjects: Physics, Math, Russian, Geometry, English, and Japanese, so you should print <code class="language-python">6</code> as the answer.</p> 
  <p>In this task, you're given the variables to work with: <code class="language-python">Belov</code>, <code class="language-python">Smith</code>, and <code class="language-python">Sarada</code>.</p> 
  <p><button class="btn-sm btn-outline-secondary" onclick="getElementById('hint-689').style.display='inline'"> Hint </button> </p>
  <div id="hint-689" style="display:none;">
   Before converting the lists into a set, sum them up as follows 
   <code class="language-python">Belov + Smith + Sarada</code>.
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  <p></p>
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</html><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 15 seconds</font><br><br>
<a href="https://hyperskill.org/learn/step/6643">Show topic summary</a>