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# c1 help !! arithmetic sequences watch

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1. hey guys, i really need some urgent help with hw. i dont know how to answerr these !s so it would be nice if you helped out.

4) (a)state the formula for the sum of the first n numbers
(b) find the sum of the natural numbers from 200 to 400 inclusive
(c) find the value of N for which the sum of the first N natural numbers is 4950

5) find the sum of the integers between 1 and 500 that are divisible by 3

thank you btw
2. Interesting choice of forum.

You need to work out the first term and common difference of the sequence of natural numbers and use the standard formulae.
3. (Original post by electriic_ink)
Interesting choice of forum.

You need to work out the first term and common difference of the sequence of natural numbers and use the standard formulae.
yeah. but seriously this needs to be handed in tommorow. i just dont get this topic. do you mind working out 4b and 4c and 5 for me please. honestly if i had the time i would sit down and try to work it through but i have other hws
yeah. but seriously this needs to be handed in tommorow. i just dont get this topic. do you mind working out 4b and 4c and 5 for me please. honestly if i had the time i would sit down and try to work it through but i have other hws
Well, in that case, yes I do mind.
5. (Original post by electriic_ink)
Well, in that case, yes I do mind.
alright then

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Updated: September 26, 2011
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