Sum of the squares of 3 no.'s is 267 and the sum of their products taken two at a time is 131. Find the sum?  Choose the correct choice from the following options.
A) 20 B) 24 C) 26 D) 23 E) 30

Rationale: "( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 267 + 2 * 131 a + b + c = √ 529 = 23 d"
Answer: D