Question

set builder form of A:(1,3,927,81)​

Answer 1

A = { x : x = 3n, n € N }

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Answer 2

Given: A = {1, 3, 9, 27, 81}

We see that, the values 1, 3, 9, 27, 81 can be generated by 3ⁿ, where n is a non-negative integer ≤ 4

∴ we can write A in set builder form as follows,

A = { x | x = 3ⁿ; n is a non-negative integer ≤ 4 }