Sum of the squares of 3 no.'s is 99 and the sum of their products taken two at a time is 131. Find the sum?
Answers:
A) 20  B) 24  C) 19  D) 28  E) 30
(a + b + c)2 = a2 + b2 + c2 + 2(ab +bc + ca) = 99 + 2* 131   a + b + c = √361 = 19   19
<result>C</result>
Sum of the squares of 3 no.'s is 99 and the sum of their products taken two at a time is 131. Find the sum?