$\"\"$

Situation:

Selecting $\"\"$ different ingredients out of $\"\"$ for a salad.

Conclusion:

Total number of ingredients salads are $\"\"$ , then $\"\"$ .

From the total salads selecting by $\"\"$ different ingredients, So $\"\"$ .

Combination:

A selection of objects in which order is not important is called a combination.

Therefore, the situation is combination because the order of the ingredients salad does not matter.

$\"\"$

Combination.