Question

if a= {1, 2, 3, 5, 7} and b={ 1, 3, 6, 10, 15}. cardinal number of a-b is

Answer 1

Answer:

n(A-B)=3

Step-by-step explanation:

Difference of two sets:

A-B={x∈ A and x ∉ B}

That is, A-B is the set of elements only in A but not in B

Given:

A= {1, 2, 3, 5, 7}

B={ 1, 3, 6, 10, 15}

A-B= {2,5,7}

since A-B contains 3 elements, candinality of A-B is 3