Solve the Problem$$\text { If } n ( A ) = 25 , n ( A \cup B ) = 73 \text {, and } n ( A \cap B ) = 21 \text {, find } n ( B ) \text {. }$$

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The Answer of Solve the Problem$$\text { If } n ( A ) = 25 , n ( A \cup B ) = 73 \text {, and } n ( A \cap B ) = 21 \text {, find } n ( B ) \text {. }$$

Solve the Problem $\text { If } n ( A ) = 25 , n ( A \cup B ) = 73 \text {, and } n ( A \cap B ) = 21 \text {, find } n ( B ) \text {. }$

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Solve the Problem If n(A)=25,n(A∪B)=73, and n(A∩B)=21, find n(B). \text { If } n ( A ) = 25 , n ( A \cup B ) = 73 \text {, and } n ( A \cap B ) = 21 \text {, find } n ( B ) \text {. } If n(A)=25,n(A∪B)=73, and n(A∩B)=21, find n(B).

Definitions:

Solve the Problem $\text { If } n ( A ) = 25 , n ( A \cup B ) = 73 \text {, and } n ( A \cap B ) = 21 \text {, find } n ( B ) \text {. }$