Sum of the squares of 3 no. is 52 and the sum of their products taken two at a time is 72. Find the sum?	Choose the correct choice from the following options:
A) 18  B) 21  C) 13  D) 16  E) 14

Rationale: "( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 52 + 2 * 72 a + b + c = â ˆ š 196 = 14 answer e"
Answer: E