a. List all 3-combinations for the set
. Deduce the value of
b. List all unordered selections of two elements from the set . Deduce the value of .
To list all combinations for the set and also, find the value of .
It is given that the set is .
Make a list of elements out of .
List out the all -combinations for the set .
Note that set of all -combinations for the set is union of all -combinations, so that the object is always included and the object is never included.
First, consider all -combinations so that the object is always included.
Take the object .
So, two more objects (elements) are required for a -Combination.
Those are .
Therefore, all -combination so that the object , is always included are. .
Next consider all combinations so that the object is never included
To list all unordered selections of two elements from the set and also, find the value of .
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