The valency of an element A is 3 and that of element B is 2. Write the formula of the compound formed by the combination of A and B.

Formula of the compound formed by the combination of A and B:

$\overset{\phantom{3}{3}}{\text{A}} \space {\swarrow}\mathllap{\searrow} \space \overset{2}{\text{B}} \Rightarrow \underset{\phantom{2}{2}}{\text{A}} \space {\swarrow}\mathllap{\searrow} \underset{\phantom{3}{3}}{\text{B}} \\[1em] \text{A}$2\text{B}3

∴ Formula of the compound is A₂B₃