# math

posted by .

The sum of the first 9 terms of an A.P is 72 and the sum of the next 9 terms is 71, find the A.P

• math (?) -

I don't know what "A.P" means.

• math -

Sure you do. :-)

The question
a) is obviously about an arithmetic progression
b) has already been posted three times!?!?!?!!?

## Similar Questions

1. ### Math 12

the sum of the first 2 terms of a geometric sequence is 3. the sum of the next 2 terms is 4/3. find the 4 terms of the sequence.
2. ### 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. Find …
3. ### Further mathematics

An exponential sequence of positive terms and a linear sequence have the same first term.the sum of their first terms is 3 the sum of their second terms is 3/2,and the sum of their third terms is 6.find their fifth terms.
4. ### arithmetic

find the common difference of A.P whose first term is 5 and the sum of its first 4 terms is half the sum of next 4 terms
5. ### 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
6. ### Further mathematics

An exponential sequence (GP)of positive terms and a linear sequence (AP)have the same first term.the sum of their first terms is 3,the sum of their second terms is 3 and the sum of their third terms is 6. Find the sum of their fifth …
7. ### 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 20th …
8. ### 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 126.Find …
9. ### Math

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.
10. ### math

The no of terms in an AP is 40 and the last is -54,given that the sum of the 15 terms added to the sum of the first 30 terms is zero.calculate(1)the first term and common difference.(2)sum of progression

More Similar Questions