Friday

October 24, 2014

October 24, 2014

Posted by **Lucas** on Sunday, February 3, 2013 at 12:08pm.

- Maths -
**Steve**, Sunday, February 3, 2013 at 2:36pma+d = ar

3/2 (2a+2d) = ar^2

3a+3d = ar^2

3(a+d) = ar^2

3ar = ar^2

3r = r^2

r = 3

So,

a+d = 3a

d = 2a

The sequences are thus

a,3a,5a,7a,9a,...

a,3a,9a,27a,...

Note that a+3a+5a = 9a, as required

Pick a value for a, and plug and chug.

**Answer this Question**

**Related Questions**

Maths - 1..The first 2 terms of a geometric progression are the same as the ...

Algebra - Determine whether each sequence is arithmetic or geometric. Find the ...

Can someone help me?! - The 1st, 5th and 13th terms of an arithmetic sequence ...

math - Determine whether each sequence is arithmetic or geometric. Find the next...

Maths - Eric thinks of 2 sequences.One is geometric and the other arithmetic....

math - suppose an arithmetic sequence and a geometric sequence with common ...

Math - A sequence is formed by adding together the corresponding terms of a ...

Math *URGENT - Please give the answers and solutions for each. 1.If the second ...

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

Maths - The first term of an arithmetic sequence is 2. The first, third and ...