Question

Let A be the set of natural numbers which are multiples of 5 strictly less than 100, and B be the set of natural numbers which divide 100. What are the cardinalities of B \ A (the set of elements in B but not in A), A ∩ B and B?
1 point

Answer 1

Answer:

A = { 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95 }

B = { 1,2,4,5,10,20,25,50 }

n(B)=8 / n(A)= 19

no A is not cardinal to B