Friday

December 19, 2014

December 19, 2014

Posted by **linda** on Tuesday, February 7, 2012 at 9:17am.

- arithmetic -
**Anonymous**, Tuesday, February 7, 2012 at 11:57amI assume you are referring to an arithmetic sequence.

a+2d + a+3d = 44

a+9d + a+14d = 203

2a + 5d = 44

2a + 23d = 203

18d = 159

d = 159/18

a = -1/12

S20 = 20/2(T1+T20)

= 167.75

**Answer this Question**

**Related Questions**

Arithmetic Progression - In an AP the 6th term is half the 4th term and the 3rd ...

arithmetic - The sum of the first 10th term of an a.p is 255,the sum of the ...

Math - 1) If the sum of the first n terms of a series is Sn where Sn=2nē-n, (a)...

math - 1) If the sum of the first n terms of a series is Sn where Sn=2nē-n, (a)...

arithmetic - An arithmetic n geometric sequence have the same first term 2.with ...

Math - Arithmetic Sequences - The sum of the 4th and the 14th term of an ...

arithmetic - given that the first term of an Ap is 7 and its 10th term is twice ...

arithmetic - if sum of 20th term in an AP is equal to sum of 30th term,what is ...

Maths - 1) In the arithmetic progression, the 8th term is twice the 4th term and...

math - the 10th term is 34 of arithmetic series and the sum of the 20th term is ...