Question

Series help. *quesiton below* will give medal

Answer 1

Can someone walk me through how to do this, please? I am completely lost as to how to go about this question

Answer 2

sum 1..100 - sum 7,17, 27,37,47,57,67,77,87,97

Answer 3

Alrighty..let me work on it :)

Answer 4

we can simplify this a bit , using sum notation

Answer 5

I've ended up with 4530 as my answer @perl

Answer 6

the sum of the first n integers from 1 to 100 is 100 * 101/2

Answer 7

WHich is 5050

Answer 8

right

Answer 9

And for for sum of numbers that include the digit 7, I ended up with 520. Then I subtracte 520 from 5050

Answer 10

correct

Answer 11

5050 - 520

Answer 12

4530