Databases Relational Algebra Basics of Sets and Relations Hacker rank solution

Prepare DatabasesRelational Algebra Basics of Sets and Relations #4 

You are given two sets.

Set A = {1,2,3,4,5,6}

Set B = {2,3,4,5,6,7,8}

What is the total number of ordered pairs present in the Cartesian Product  ? Only enter the correct integer in the answering box. Do not include any extra spaces, tabs or newlines.

Answer:-

42