2^3^2 = 29
2^2^3 = 28
3^2^3 = 38
3^3^3 = 327
As 327 > 38, 29 > 28 and 327 > 29. Hence 327 is the greatest among the four.
Which among the following is the greatest?

  * 2^3^2
  * 2^2^3
  * 3^2^3
  * 3^3^3
  * 5^3^3