Question
Write the following sets in set$-$builder $($Rule Method$)$ form$ :$ $B_1 = {6, 9, 12, 15 ....}$
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Answer
$B_1 = {6, 9, 12, 15 ....}$
$= {x : x = 3n + 3; n \in N}$
$= {x : x = 3n + 3; n \in N}$
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