- #1
Timiop2008
- 31
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Arithmetic Sequences - PLEASE HELP!
I would really appreciate any help to figure out the following 4 questions:
1) The Sum of the first two terms of an arithmetic progression is 18 and the sum of the first four terms is 52. Find the sum of the First eight terms
2) An arithmetic Progression has first term a and common difference -1. The sum of the first n terms is equal to the sum of the first 3n terms. Express a in terms of n.
3) Find the sum of the arithmetic progression 1,4,7,10,13,16,...,1000.
Now find the sum if every third term is removed
4) In the Sequence 1.0,1.1,1,2...,99.1,100.0 each number after the first is 0.1 greater than the previous number. Find: 1) the number of number is the sequence and 2) the sum of the numbers in the sequence.
I don't think I know any of the relevant equations (If there are any that is)
Please Help!
Thankyou
I would really appreciate any help to figure out the following 4 questions:
1) The Sum of the first two terms of an arithmetic progression is 18 and the sum of the first four terms is 52. Find the sum of the First eight terms
2) An arithmetic Progression has first term a and common difference -1. The sum of the first n terms is equal to the sum of the first 3n terms. Express a in terms of n.
3) Find the sum of the arithmetic progression 1,4,7,10,13,16,...,1000.
Now find the sum if every third term is removed
4) In the Sequence 1.0,1.1,1,2...,99.1,100.0 each number after the first is 0.1 greater than the previous number. Find: 1) the number of number is the sequence and 2) the sum of the numbers in the sequence.
I don't think I know any of the relevant equations (If there are any that is)
Please Help!
Thankyou