2+12+22+...+1002+1012+1022=​

52736

Решил на Python:

Код:

in_all = 0

for i in range(103):

   value = 2 + i * 10

   in_all += value

   if i == 0:

       print(f'First value is {value}')

   elif i == 102:

       print(f'Last value is {value}')

print(f'Sum is {in_all}')

Вывод:

First value is 2

Last value is 1022

Sum is 52736