Permutation & Combination for Washington DC
Math · USA · Washington DC
Washington DC · Sales tax (state base): 6% · Property tax (state avg effective): 0.55% · Median home price (state est.): $700,000
City/county taxes vary. State-level estimates used only for default values. Amounts in USD.
City/county taxes vary. State-level estimates used only for default values. Amounts in USD.
nPr720
nCr120
About the Permutation & Combination calculator for Washington DC
Use this free Permutation & Combination calculator for Washington DC. Enter n, r and it shows npr, ncr instantly. Default values use common US figures in USD. With the default values, the npr comes to 720.
How the Permutation & Combination calculation works
nPr = n! ÷ (n−r)! when order matters. nCr = n! ÷ (r! × (n−r)!) when it does not.
Tip: Ask whether order matters: a race podium uses permutations, a lottery uses combinations.
Frequently asked questions
What does the Permutation & Combination calculator do for Washington DC?
It takes n, r and instantly calculates npr, ncr.
Is the Permutation & Combination calculator for Washington DC free?
Yes. It is free, needs no signup and runs in your browser, so your numbers are not stored.
What are the sales and property tax rates in Washington DC?
Washington DC has a 6% state sales tax and an average effective property tax of about 0.55%. Local rates vary, so check your city or county.