3. Arrows Write a program that prompts the user for a number of columns, and them prints the pattern as seen below. You cannot assume that the user will supply positive numbers - if they misbehave you should re-prompt them until they do give you a positive number Note that your program only has to run one time, but multiple runnings of the program are shown below: Example 1 How many columns? 3 Example 2 How many columns? 5 Example 3 How many columns? -5 Invalid entry, try again! How many columns? -2 Invalid entry, try again! How many columns? 6