# Math

The sum of 11terms of an Ap is 891 find the 28th and 45th terms if the common difference is 15

1. 👍 0
2. 👎 0
3. 👁 36
1. assuming you mean the sum of the first 11 terms is 891, you have
11/2 (2a + 10*15) = 891
Having a, you want
a+27d
a+44d

1. 👍 0
2. 👎 0

## Similar Questions

1. ### math

the sum of 11terms of A.P is 891.find the 28th and 45th terms if the common difference is 45

asked by emi on June 7, 2014
2. ### maths

the sum of 11 terms of an A.P is 891. find the 28th and 45th terms if the common difference is 15

asked by justine on January 28, 2017
3. ### 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?

asked by ramla on June 14, 2016
4. ### Math - Arithmetic & Geometric

1) Given the terms a35 = 1238 and a70 = 1483 of an Arithmetic. Find the exact value of the term a105 a sequence and sum of sequence. 2) Given a3 = 99 and a5 = 891 of a Geometric. Find the exact value of the term a7 of the sequence

asked by Student555 on February 28, 2011
5. ### AP and GP

1) Given the terms a35 = 1238, a70 = 1483 of an AP. Find the exact value of the term a105 a sequence, and sum of sequence. 2) Given the term a3 = 99 and a5 = 891 of GP. Find the exact value of the term a7 of the sequence and the

asked by Newbie on February 27, 2011
6. ### Geometric

1) The sum of last three terms of GP having n terms is 1024 time the sume of first 3 terms of GP. If 3rd term is 5. Find the last term. 2) The sum of the first eight terms of a GP is five times the sum of the first four terms.

asked by Sniper on February 27, 2011
7. ### Math3c

1.Find an A.P. such that the sum of the first three terms is one half the sum of the next four terms,the first term being 12. 2.In an A.P.,the sum of the first three terms is 18,and the sum of the squares of these terms is

asked by Selena on August 17, 2016
8. ### Math

Sum of4th and the 6th terms of an a,p is 42 . While the sum of the 3rd and 9th terms of the same a.p is 52. Find the (a) first term (b)common difference (c) sum of the first ten terms of the progression. Solution

asked by Terfa sakaa on October 14, 2012
9. ### Day secondary school kataeregi

The first and last terms of an a.p are 79 and 5 and it's sum is 814 find(a) the number of terms in the a.p(b)the common different between them.(c) the 9th terms is of an a.p is 52, while the 12th terms is 70 find the sum of it's