Sum of the squares of three numbers is 222 and the sum of their products taken two at a time is 131. Find the sum? Choices:  A) 22  B) 25  C) 26  D) 28  E) 29
(a + b + c)2 = a2 + b2 + c2 + 2(ab +bc + ca) = 222 + 2* 131   a + b + c = √484 = 22   22
<result>A</result>
Sum of the squares of three numbers is 222 and the sum of their products taken two at a time is 131. Find the sum?