Question

Let A be the set of prime numbers less than 20.Find Cardinality of A . *​

Answer 1

$\textbf{Given:}$

$\textsf{A be the set of prime numbers les than 20}$

$\textbf{To find:}$

$\textsf{Cardinality of A}$

$\textbf{Solution:}$

$\underline{\textsf{Concept used:}}$

$\textsf{Prime number is a number whose only divisors}$

$\textsf{are 1 and itself}$

$\textsf{Then, the prime numbers les than 20 are}$

$\mathsf{2,3,5,7,11,13,17,19}$

$\therefore\mathsf{A=\{2,3,5,7,11,13,17,19\}}$

$\textsf{A contains exactly 8 elements}$

$\implies\boxed{\mathsf{n(A)=8}}$

$\textbf{Find more:}$

 A = { 2,7,9,11}  then the cardinality of set A is​

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