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

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 8:14pmwell, 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 8:19pmThank you very much

- Algebra-Please help -
**Damon**, Sunday, May 8, 2011 at 8:21pmYou are welcome :)

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