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:
A.15
B.20
C.25
D.35
Answer:B
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:
A.15 B.20 C.25 D.35