The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is :___________?
Q1. The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is :___________?
Answer: 20
Explanation: The correct value is 20. Apply the formula or arithmetic step shown in the question and