Are the sets $A = \{b, c, d, e\}$ and $B = \{x : x$ is a letter in the word $\text{‘MASTER’\}}$ joint?
✓
Answer
$A = \{b,c,d,e\}$
$B = \{x : x$ is a letter in the word $\text{"MASTER"\}}$
$∴ B = \{m, a ,s, t, e, r\}$
Hence set $A $ and set $B $ are joint because these sets have element e in common.
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