Question

The cardinal number of the set A=( : = n3

, n ∈ W and n<6)​

Answer 1

given n3, n<6,n belongs to whole numbers so

n=0,1,2,3,4,5

so

set A = n3

ie0×3, 1×3,2×3,3×3,4×3,5×3

which will give you 0,3,6,9,12,15

A={0,3,6,9,12,15}

cardinal numbers is the number of elements in a set so set A has 6 elements

therefore we can conclude that the cardinal number of set A is 6