Question

The cardinal number of the set A = {Letters of the word APPLE} is _________.

• A. 5
• B. 1
• C. 0
• D. 4

Answer 1

The correct option is D 4

Given,
A = {Letters of the word APPLE}
$\Rightarrow$ A = {A, P, L, E}

($\because$ While listing the elements of a set, we do not repeat any element.)

$\Rightarrow n\left(A\right)=4$
$\therefore$ The cardinal number of the given set $A$ is 4.