Sum of the squares of 3 no. is 156 and the sum of their products taken two at a time is 50. Find the sum?	Choose the correct choice from the following answers: A) 18 B) 16 C) 19 D) 21 E) 15

Rationale: ( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 156 + 2 * 50 a + b + c = â ˆ š 256 = 16 answer b
Answer: B