1234 + 2345 + 3456 + 4567 + 5678 + 6789 + 789
= (1234 + 2345) + (3456 + 4567) + ( 5678 + 6789) + 789
= 3579 + 8023 + 12476 + 789
= 11602 + 13265
= 24876
1234+2345+3456+4567+5678+6789+789=24858
=(1234+2345)+(3456+4567)+(5678+6789)+789
=3579+8023+12467+789
=11602+13256
=24858
1234 + 2345 + 3456 + 4567 + 5678 + 6789 + 789 = 20291