Infinitely many.
Start with sums of two whole numbers:
5+4, 6+3, 7+2, 8+1, 9+0, 10+(-1), 11+(-2), ... and infinitely more.
Then consider numbers to one decimal place (dp):
4.5+4.5, 4.6+4.4, 4.7+4.3, and infinitely more of those.
And then numbers with 2 dp, 3 dp, ... infinitely many dp.
Next, consider sums of 3 numbers, 4 numbers, 5 numbers, ... , infinitely many numbers - in each case using numbers with 1 dp, 2 dp, 3 dp, ... infinitely many dp.
When you have done all those you can start with multiplications.
And then move on to other mathematical operations.
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An infinite number of ways. 99+9/9 (99+9/9)*9/9 (99+9/9)*99/99 (99+9/9)*999/999 (99+9/9)*9/9*9/9 etc
4! = 4 * 3 * 2 * 1 = 24 ways[1]
nine 9
The answer is 9C4 = 9*8*7*6/(4*3*2*1) = 126 ways.
it is the same number as the sausages in your but