title: finding different permutations for a total sum using given operands and operator
body: <p>I have a problem with a operator 
  <code>(+, -, /, * )</code>
  with a total sum using those operators and number of operands. </p>
  
  <p>so for example i need to get total of 6 using 3 operands (1, 2, 3) and + operator, what can be the total number of permutations for that particular result. </p>
  
  <p>i could not even think of the approach yet. Can anyone help me regarding that. I am using Java. </p>
  
  <p>Thanks</p>