The sum of all the integers k such that –21 < k < 24 is Choose the correct choice from the following answers.
A) 0	B) - 2	C) - 25	D) - 39	E) - 51

Rationale: "- 20 - - - - - - - - - - - - - - - - - - 0 - - - - - - - - - - - - - - - - - 23 values upto + 23 cancels outwe are left with only - 20 - 19 sum of which is - 39 . hence option d . d"
Answer: D