Sum of the squares of 3 no.'s is 62 and the sum of their products taken two at a time is 131. Find the sum? Choose the correct choice from the following answers
A) 20  B) 24  C) 26  D) 18  E) 30

Rationale: "( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 62 + 2 * 131 a + b + c = √ 324 = 18 d"
Answer: D