Sum of the squares of 3 no.'s is 179 and the sum of their products taken two at a time is 131. Find the sum?	Choose the correct answer:
A) 20
B) 21
C) 26
D) 28
E) 30
(a + b + c)2 = a2 + b2 + c2 + 2(ab +bc + ca) = 179 + 2* 131   a + b + c = √441 = 21   21
<result>B</result>
Sum of the squares of 3 no.'s is 179 and the sum of their products taken two at a time is 131. Find the sum?