You are Here: Home >< A-levels

# Maths Core 2 Sequence Question watch

Announcements
1. Hello I'm very new to this website but I was wondering if anyone could help me out with my homework? The question goes,..

"There is a flowerhead at the end of each stem of an oleander plant. The next year, each flowerhead is replaced by three stems and flowerheads.

(iii) The total number of stems in year 2 is 4, (that is, 1 old one and 3 new ones). Similarly, the total number of stems in year 3 is 13, (that is, 1 + 3 + 9).

Show that the total number of stems in year 'n' is given by (3^n - 1)/2

2. (Original post by ela_Roxas29)
Hello I'm very new to this website but I was wondering if anyone could help me out with my homework? The question goes,..

"There is a flowerhead at the end of each stem of an oleander plant. The next year, each flowerhead is replaced by three stems and flowerheads.

(iii) The total number of stems in year 2 is 4, (that is, 1 old one and 3 new ones). Similarly, the total number of stems in year 3 is 13, (that is, 1 + 3 + 9).

Show that the total number of stems in year 'n' is given by (3^n - 1)/2

What have you tried/done so far? You should hopefully know that for a geometric series, the sum of n terms is given by:

See if you can use that..
3. Oh, someone actually answered my question! As I said, I am very new to this and did not expect anything so thank you so much! I've already answered the question but thank you for the equation!
4. (Original post by usycool1)
What have you tried/done so far? You should hopefully know that for a geometric series, the sum of n terms is given by:

See if you can use that..

• Oh, someone actually answered my question! As I said, I am very new to this and did not expect anything so thank you so much! I've already answered the question but thank you for the equation!

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 21, 2015
Today on TSR

### Exam Jam 2018

Join thousands of students this half term

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets