Sum of the squares of 3 no. is 252 and the sum of their products taken two at a time is 116. Find the sum?  Choose the correct choice from the following options.
A) 24
B) 33
C) 22
D) 20
E) 21

Rationale: "( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 252 + 2 * 116 a + b + c = â ˆ š 484 = 22 answer c"
Answer: C