sum of the squares of 3 numbers is 222 and the sum of their products taken two at a time is 131 . find the sum ?	Choose one
A) 22 B) 25 C) 26 D) 28 E) 29

Rationale: ( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 222 + 2 * 131 a + b + c = √ 484 = 22 a
Answer: A