Find n(a) of the set {-3,-1,1,3,5,7,9}

n(A) = 7

Step-by-step explanation:

Let set A be A = {a,b,c}

We can say n(A) = 3

So basically n(A) means the "number of elements (unique) in set A"

They have to be unique.

For this problem, set A is:

A = {-3,-1,1,3,5,7,9}

If we count, there are 7 unique elements in this set. Thus:

n(A) = 7