$$B=\{1,2,3,4,5\},\qquad A=\{2,k\},$$ where $k$ is an integer. Find every possible value of \

Question

$$B=\{1,2,3,4,5\},\qquad A=\{2,k\},$$ where $k$ is an integer. Find every possible value of $k$ if $$A\subset B\qquad\text{and}\qquad n(A)=2.$$ Explain why $k=2$ is excluded.

Accepted Answer

$k\in\{1,3,4,5\}$; $k=2$ gives only one distinct element

Sets

Sets

Solution:

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