jquery - last element with a class name in a div -

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How can I add id = test to the class in a div? In this case I have div = 1000 

  with content and Lt; Div id = "test" & gt; & Lt; Div class = "a" & gt; 1 & lt; / Div & gt; .. 
 
 You can use it:  
  $ ('# test div.a: last')

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