Question

Only for 11th Maths students ....
If Roaster Form is {3,6,9,12}
Then if I write set - builder form
A = {x : x is a multiple of 3 and
0 < x < 12}.
Then am I correct ?????
It's urgent please answer ......
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Answer 1

Let r = {3, 6, 9, 12}

here r is set of all positive integral multiple of 3 less than and equal to 12.

so, we can write r, in set - builder form

r = { x : x = 3n , n \in N, 1 ≤ n ≤ 4}

please make me brainlist

Answer 2

Answer:

{3x : x = 1,2,3,4}

Your way is wrong because in your way 12 is not included and also this is a better and shorter way to express.