Mathematical problems (on the division of numbers) The natural numbers that can be divided by both 5 and 7 are arranged in a row from 35 to large. Q: what is the sum of 1993 numbers in this column and the remainder divided by 11?

Mathematical problems (on the division of numbers) The natural numbers that can be divided by both 5 and 7 are arranged in a row from 35 to large. Q: what is the sum of 1993 numbers in this column and the remainder divided by 11?

Count the last term first
(1993-1)*35+35=69755
Then calculate the sum
(35+69755)*1993/2=69545735
The remainder of 69545735 divided by 11 is
(5+7+4+9)-(3+5+5+6)=6
6 is the remainder