/* This is an application to help someone to calculate factorials, combinations and permutations
* Exit and Reset Button - use a messagebox to confirm with the user before performing the actions
* Submit Button
* The user can select any options - if no options are selected, provide a messagebox to inform the user there are no selections, clear the form
* Only integer numbers greater than 0 are allowed in N and r.
* Make sure that the listbox is empty for each submission.
* Factorial - if two numbers are entered, calculate the factorial of the two numbers
* Factorial N! = 1 x 2 x 3 x 4 .... x N, e.g. Factorial 4! = 1 X 2 X 3 X 4 = 24
* This is basically using looping to multiply the number starting from 1 until you reach the last number.
* Once you have the factorials, you can then use the results to calculate the permutations and combinations.
* Combination and Permutation - here you should also check that r is smaller or equal to N
* Combination (N, r) = N!/(r!(N-r)!, e.g. Combination (4,2) = 4!/2!(4-2)! = 24/(2x2) = 6
* Permutation (N, r) = N!/(N-r)!, e.g. Permutation (4,2) = 4!/(4-2)! = 24/2 = 12
* Display the outputs in the listbox
13 freelancers are bidding on average $29 for this job
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HI there, I am very much confident about your project. I can do it within your time and budget. Feel free to message me. It's an easy task for me. Thanks a lot..