Given a set s how many subsets of s contain at most 2 elements

Given a set S of cardinality , the subsets containing at most 2 elements are:

There is clearly only one empty set, and there are subsets containing one element (you choose one of the n elements in S to create your subset)

Finally, the number of subsets containing two elements is

In fact, in general, the binomial coefficient represents the number of subset of cardinality k that you can build from a set with cardinality n.

So, if we update our list, we have the following subsets:

For a total of

subsets with at most two elements.

answer: idk

step-by-step explanation:

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.