If you were responding on a concurrent VI30 second COD and y
     If you were responding on a concurrent VI-30 second COD, and you switched back and forth from one schedule to the other every 1.5 seconds (that is, left, right, left, etc.), reinforcement would occur:  on the average, every 30 seconds and 15 responses  on the average, every 30 seconds and 30 responses  on the average, every 15 responses  never 
  
  Solution
Option (b)- On an average, every 30seconds and 30 responses
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