Question

Given $A=\{5,6,7\}$ and $B=\{3,4\}$. Form all possible ordered pairs and write the total number of ordered pairs formed. So that :

Both the components are from A

Find the total number of such pairs.

Answer 1

Possible ordered pairs with both components from A are $(5,5),(5,6),(5,7),(6,5),(6,6),(6,7),(7,5),(7,6),(7,7)$

Thus the total number of such ordered pairs is 9.