Question

If A={$x:x=3n,n\in N,4\le n\le 6\}$ and B = {12, 15, 18}, then A and B are ___________.

• A. equal sets
• B. equivalent sets
• C. disjoint sets
• D. null sets

Answer 1

The correct option is A

equal sets

Given the set A = { $x:x=3n$, $n$ $\in N,4\le n\le 6\}.$

To find the elements of A, we substitute $n$ = 4, 5 and 6 in the equation $x=3n$.

Thus, we get the set A = {12, 15, 18}.

Given B = {12, 15, 18}.

A and B have the same elements.

$\therefore$ A and B are equal sets.