Sum of the squares of 3 no. is 149 and the sum of their products taken two at a time is 70. Find the sum?  Answers:	A) 17	B) 19	C) 21	D) 13	E) 18

Rationale: "( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 149 + 2 * 70 a + b + c = â ˆ š 289 = 17 answer a"
Answer: A