Combinations with Replacement Calculator

How does the Combination with Variable Calculator work? Calculates the following: Solves for r given n and the combination value. Solves for n given r and the combination value This calculator has 1 input. What 2 formulas are used for the Combination with Variable Calculator? nPr=n!/r! nCr=n!/r!(n-r)! What 3 concepts are covered in the Combination with Variable Calculator? combination a mathematical technique that determines the number of possible arrangements in a collection of items where the order of the selection does not matter nPr = n!/r!(n - r)! factorial The product of an integer and all the integers below it variable Alphabetic character representing a number Example calculations for the Combination with Variable Calculator C(9,r) = 126 9Cr = 126 C(n,3) = 165 nC3 = 165 Get the tablet and products I use for math here: https://www.amazon.com/shop/mathcelebrity Get the tablet and other products from my videos here: https://www.amazon.com/shop/mathcelebrity