Homework Help: Algebra-Please help

Posted by Anna- on Sunday, May 8, 2011 at 7:54pm.

We're working on geometric and athrimetic series and I really don't know where to start with this except that t sub 1 = 101
How would I find the sum of the multiples of 5 between 101 and 2001 help

Algebra-Please help - Damon, Sunday, May 8, 2011 at 8:14pm
well, the first multiple of 5 in that interval is 105.
The last is 2000.
105 + 110 + 115 + ........ 2000
n-1 = (2000-105)/5 = 379
n = 380

Sum = (n/2)(a1+an) = (380/2)(2105)
=399,950
Algebra-Please help - Anna-, Sunday, May 8, 2011 at 8:19pm
Thank you very much
Algebra-Please help - Damon, Sunday, May 8, 2011 at 8:21pm
You are welcome :)

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