Find the sum of all 3 digit positive numbers divisible by 7

I'm getting stuck somewhere...

Question

Find the sum of all 3 digit positive numbers divisible by 7

I'm getting stuck somewhere...

anonymous · Answer

Okay so I get the first term 104, last 994 and that it is arithmetic. Though I'm not sure if I'm putting it into the sum formula correctly:

142= number of terms

142(105+994) (1/2) and then getting 78029...not sure if that is the right answer

raden · Answer

the last term was correct, but not the 1st term. it should 105, right ?

anonymous · Answer

Woops, typed that wrong. Yep you are correct.

raden · Answer

if so, you are right :)

anonymous · Answer

Oh great! For some reason I had a different number down as the answer and was wondering if that was wrong or something I did was wrong. Thanks for the help!

raden · Answer

you're welcome :)