10 Choose 0

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Total items (n)
Items chosen (k)

What is 10 choose 0?

Answer

10 choose 0 is
1

Order doesn't matter, no repeats: 1 way to choose 0 of 10 items.

There is exactly one way: take none.

C(10, 0) = 10! / (0! · 10!)

= 1

0! = 1 (an empty product), so 10! cancels out completely.

Row 10 of Pascal's triangle
k10 choose k
01
110
245
3120
4210
5252
6210
7120
845
910
101

Row sum: 210 = 1,024 — all subsets of 10 items.

See Also

FAQ

What is 10 choose 0?

10 choose 0 is 1

Why is 10 choose 0 the same as 10 choose 10?

Every way to choose 0 of 10 items leaves exactly 10 behind, so choosing 0 and choosing which 10 to leave out are the same count: 10 choose 0 = 10 choose 10 = 1. In the formula n! / (k! (n − k)!) the two factorials below just swap places.

How many ways are there if order matters?

The same 1: with 0 chosen items there is only one order, so P(10, 0) = 10 choose 0 = 1. Order starts to matter from 2 items on: n × (n − 1) arrangements.