Sum of the squares of three numbers is 522 and the sum of their products taken two at a time is 131. Find the sum? Choose the most appropriate option
A) 20  B) 22  C) 25  D) 27  E) 28
(a + b + c)2 = a2 + b2 + c2 + 2(ab +bc + ca) = 522 + 2* 131   a + b + c = √784 = 28   28
<result>E</result>
Sum of the squares of three numbers is 522 and the sum of their products taken two at a time is 131. Find the sum?