1.

The sequence \((\frac{3^n}{n!} )\) is1. bounded2. unbounded3. convergent4. monotonic

Answer» Correct Answer - Option 4 : monotonic

Concept:

 A sequence {an} is said to be 

  • increasing if m < n implies am ≤ an
  • strictly increasing if m < n implies am < a
  • decreasing if m < n implies  am ≥ an
  • strictly decreasing if m < n implies am > a
  • monotone if it is either increasing or decreasing


Calculation:

 Let us look at the first few terms of this sequence. These are 

3, 9/2, 9/2, 27/8, 81/80, 243/560, ....

You can see that the first 5 terms of this sequence are in increasing order However, the 6th term is less than the 5th term. Hence, the sequence is neither increasing nor decreasing. That is the sequence is not monotone.



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