Question

The Cardinality of this set {7,8,9) includes

a. n(P) = 3
b. n(P) = 6
c. n(P) = 24
d. n(P) = 2

Answer 1

The Cardinality of this set {7,8,9} is n(P) = 8.

Explanation:

Because:

n(P) = {{}, {7}, {8}, {9}, {7, 8}, {8, 9}, {7, 9}, {7, 8, 9}}

Hence by the formula 2^k.

where, k = number of elements in the set.

The cardinality is 8.

Answer 2

The answer is n(p)=3