Sum of the squares of three numbers is 138 and the sum of their products taken two at a time is 131. Find the sum? Choose the correct choice
A) 20	B) 21	C) 25	D) 27	E) 29
(a + b + c)2 = a2 + b2 + c2 + 2(ab +bc + ca) = 138 + 2* 131   a + b + c = √400 = 20   20
<result>A</result>
Sum of the squares of three numbers is 138 and the sum of their products taken two at a time is 131. Find the sum?