(169)^2 - (168)^2 =
Choose the correct choice from the following answers:
A) 1  B) 100  C) 229  D) 329  E) 337

Rationale: using the formula : ( a + 1 ) ^ 2 - a ^ 2 = 2 a + 1 so , answer = 168 * 2 + 1 = 336 + 1 = 337 = answer = e
Answer: E