10P2 — Permutations of 10 Things Taken 2 at a Time
10P2 equals 90 — there are 90 ordered arrangements of 2 items chosen from 10.
How to use this tool
- Enter n (total items) and r (items chosen) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your npr and the full breakdown beneath it.
10P2 finds the number of ordered pairs you can pick from a set of 10 items.
Frequently asked questions
- What is a permutation?
- A permutation is an ordered arrangement. nPr = n!/(n-r)!. For example, P(5,2) = 5×4 = 20 ordered pairs from 5 items.