the sum of all the integers k such that – 24 < k < 24 is
"- 23 - - - - - - - - - - - - - - - - - - 0 - - - - - - - - - - - - - - - - - 23 values upto + 23 cancels outwe are left with only - 23 - 22 sum of which is - 45 . hence option d . c"
add(add(negate(24), const_1), add(add(negate(24), const_1), const_1))