If A={a,b,c,d}. How many subsets does the set A have?

How many points does the given figure has ?

If A = {a, b, c}. Write all the subsets of set A.

Is any set subset to itself?

How many medians a triangle will have?

Let A = { a, e, i, o, u} and B = { a, b, c, d} . Is A a subset of B ? No. (Why?). Is B a subset of A? No. (Why?)

Which chemical compound has the following Lewis notation : How many valence electrons does element Y have?