Question

the sum of the multiples of 7 between 0 and 1000?

Answer 1

\[\frac{1-7^n}{1-7}\]

Answer 2

or am i thinking awry

Answer 3

oh im thinking awry lol

Answer 4

7n < 1000

n = 1000/7 = 142.xxxx

7*142 = 994

Answer 5

142(7+994)
----------- should be close
2

Answer 6

71071 if i did mine right

Answer 7

this is an arithmetic series a1 = 7 and last term is 994 number of terms = 142

sum = 142/2 * [7 + 994]
= 71 * 1001

Answer 8

yep amis - thats it

Answer 9

yay!!

Answer 10

no more awry!!!!

Answer 11

i think you thought geometric at first , right?

Answer 12

yep