Question

A is the set of integers greater than or equal to -8 and less than or equal to - 1

B={-21, 20, 21, 25, 29}
(a) Find the cardinalities of A and B.
n (A) =
n(B) =

Answer 1

`n(A)=8`

`n(B)=5`

Explanation:

The cardinality is the number of elements in the set.

We need to list the element of the first set A, the set of integers greater than or equal to -8 and less than or equal to - 1

A={-8,-7,-6,-5,-4,-3,-2,-1}

The number of elements in this set is 8.

`\therefore n(A)=8`

The second set is B={-21, 20, 21, 25, 29}.

The number of elements in this set is 5

`\therefore n(B)=5`