Question

if A={3,6,9,12,15} write its set builder form

Answer 1

Answer:

A = {3n | 1<=n<=5}

Step-by-step explanation:

A={3,6,9,12,15} looks like the multiples of 3 (3n)

for n=1, 3n = 3(1) = 3

for n=2, 3n = 3(2) = 6

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for n=5, 3n = 3(5) = 15

n is in the range of [1, 5] or 1<=n<=5

Now, we will try to write set builder form for A,

A = {3n | 1<=n<=5}

Note: | denotes such that