title: "incorrect number of probabilities" error using sample()
body: <p>I was trying sample(), however whenever I used custom probability in it ,it constantly displays "incorrect number of probabilities"</p>
  
  <p>I've tried pretty much everything but still stuck. Kindly guide me as to what I am doing wrong..</p>
  
  <p>Code:</p>
  
  <pre><code>sample(10:50,4,replace = T,prob = c(.1,.2,.3,.4))   
  </code></pre>
  
  <blockquote>
    <p>Error in sample.int(length(x), size, replace, prob) :<br>
         incorrect number of probabilities</p>
  </blockquote>