# Count Combinations of numbers N times

#### Stephen_IV

##### Well-known Member
How do I use the Combin Function to count how many combinations of 5 Digit Unique Random Numbers numbers there are ranging from 0 to 9. Those 5 digits can range from 00000 to 99999?

I understand that there will be a tun of combinations i would just like a count.

Tried =Combin(1234567890,5)

### Excel Facts

Square and cube roots
The =SQRT(25) is a square root. For a cube root, use =125^(1/3). For a fourth root, use =625^(1/4).

Hi

Isn't it just

=10^5

?

#### ravishankar

##### Well-known Member
Hi
you have 10 digits (1 2 3 4 5 6 7 8 9 0 ) selected 5 at a time.
So = combin(10,5) = 252 possible combinations. Waht you have tried is when you have 1234567890 (12 billion) numbers taken 5 at a time.
Ravi

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