Question

A={3, 9, 15, 21, 27} set-builder method​

Answer 1

Answer:

A = {x: x is multiples of 3 , x<28 }

Answer 2

Answer:

A= [x:x3 ×n , where n belongs to a natural number, n <28 ]

is correct answer . 100 %sure

Explanation:

n may be 3 × 3, 3× 5 , 3 × 7 , 3 × 9

= 3 , 5 , 7 , 9

mark as brainliest answer.