SOLUTION: Please help me solve the question: Find the sum of all the multiples of seven between 18 and 711 Thanks =)

Question 618264: Please help me solve the question:
Find the sum of all the multiples of seven between 18 and 711
Thanks =)
Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!
Please help me solve the question:
Find the sum of all the multiples of seven between 18 and 711
Thanks =)

Since the multiples of 7 that are between 18 and 711 start at (7 * 3), and end at (7 * 101), then the smallest number is , and the largest number is in the series

Additionally, the number of numbers with a difference of 7 between them, which starts at 21 and ends at 707, inclusive, is computed as follows: , or , or

The sum of a series of numbers can be found by applying the following formula:
, with n being the number of numbers; and and being the smallest and largest numbers in the series, respectively

---- Substituting 99 for n; 21 for and 707 for , respectively

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