what is the sum of 60 consecutive integers from - 30 inclusive , in a increasing order ?
from - 39 to - 1 - - > 30 nos . zero - - > 1 number from + 1 to + 29 - - > 29 nos . when we add up nos . from - 30 to + 29 sum will be - 30 for total 60 numbers . c is the answer .
add(30, const_1)