# math

The sum of 5th term and 24th term is 50
Find the sum of first term and 28th term.
Also find sum of 28th term of this sequence?

1. 👍
2. 👎
3. 👁
1. T5 + T24 = 50
a+4d + a+23d = 50
a + a+4d+23d = 50
a + a+27d = 50
T1 + T28 = 50

1. 👍
2. 👎
2. I assume you are dealing with an AS

a+4d + a+23d = 50
2a + 27d = 50

sum of first and 28th
= a + a+27d
= 2a + 27d
= 50

28th term = a + 27d
= 50 - a

1. 👍
2. 👎
3. the first term of a.p is 50 and the fifth term is 25 .find the sum of the first 10th term

1. 👍
2. 👎
4. ade mistakenly approximate 0.005642 to 2s.f instead of 2d.p. what the percentage error correct to 2 d.p

1. 👍
2. 👎

## Similar Questions

1. ### algebra

The fifth term of an A.P exceeds twice the second term by 1.The tenth term exceeds twice the fourth term by 3. Find:1.the first term. 2.the common difference. 3.the sum of first twenty five terms.

2. ### math

The 3rd term of an Arithmetic Progression is 10 more than the first term while the fifth term is 15 more than the second term. Find the sum of the 8th and 15th terms of the Arithmetic Progression if the 7th term is seven times the

3. ### Mathematics

The sum of the 3rd term and the sum of the 5th term of a G.P is-60 and the sum of the 5th term and 7th is-240 find the common ratio and the first term

4. ### Mathematics

In a geometric progression the 3rd term is 4 times the 1st term and the sum of the 2nd term and the 4th term is 30. Find the positive common ratio, the first term, and sum of the first 7 terms

1. ### Maths

The 3rd and 4th term of geometric progression are 4 and 8 respectively find: The first term and common ratio, The sum of the first 10 term, The sum of infinity.

2. ### Math

The 3rd and 9th term of a g.p are 54 and 39,336 respectively.find the 6th term,sum of 4th term,sum of 4th and 7th term and product of 2nd and 5th term

3. ### MATH

THE 14TH TERM OF AP IS 96 WHILE THE 25TH TERM IS 173 FIND THE A.19TH TERM B.SUM OF 13TH AND 56TH TERM

4. ### quine

The 2nd and 5th term of a geometric progression are - 6 & 48 find the sum of the first four term respectively

1. ### mathematics

A goemetric progression is such that the 3rd term is 9times the first term ,while the 2nd term is one-twenty fourth of the 5th term.Find the 4th term

2. ### math

given the geometric series 1+2+4+8 find the sum between (inclusively) the 5th term and the 15th term. what I did I'm sure its wrong but I tired like that : the 5th term is 16 because the r is *2 in each term and the a5th term is :

3. ### Math

The 5th term of the expontential sequence is 4375 and 2nd term is 35, (a) Find the 6th term (b) Sum of the five term

4. ### Math

In an arithmetic progression, the 5th term is six times the 1st term and the sum of the first six terms is 99. Find the 1st term and the common difference. Attempt at solution: U5 = 6(U1) 99 = 3(2[U1] + 2d)