Question

What is the cardinal number of following sets?

The set of scientists: Raman, Bhabha and Einstein

Answer 1

The number of distinct elements in a finite set is called the cardinal number of the set. It is denoted by $n\left(A\right)$

Given set:

The set of scientists: Raman, Bhabha and Einstein

The number of element in the given set is $3$

Hence, Cardinal number of the set of scientists: Raman, Bhabha and Einstein is $n\left(A\right)=3$