In the set of positive integers from 1 to 100, what is the sum of all the odd multiples of 5?
In the set of positive integers from 1 to 100, what is the sum of all the odd multiples of 5?
Answer/Solution
500
Steps/Work
reduce 1 - 100
5 - 15 - 25 - 35 - 45 --55--65--75--85--95 are valid multiples. Add them -->500
E
5 - 15 - 25 - 35 - 45 --55--65--75--85--95 are valid multiples. Add them -->500
E