Pascals Triangle, arithmetic sequence.

In summary, the conversation discusses the conditions for numbers p, q, and r to form an arithmetic sequence, which means that q is in the middle of p and r and there is a constant difference between each number. For a geometric sequence, the same conditions apply but on a logarithmic scale.
  • #1
sg001
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0

Homework Statement



Write down the condition for the numbers p, q, r to form an arithmetic sequence.


Homework Equations





The Attempt at a Solution



Have no idea, but I looked at the answer and they have assigned each letter with a given value (number). How is this possible?
 
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  • #2
sorry the answer is q = 1/2 (p + r)

then they ask for it in a geometric sequence, and the answer to this q^2 = pr

any help would be appreciated... I tried searching the net but they only had examples with numbers containing a certain distance between each other. ie 5,7,9,11...
 
  • #3
Hi sg001
An arithmetic sequence means for p, q, r that to get q from p, you add a constant.
and to get r from q, you add the same constant.
If you look at p, q, r, (say, put them on a ruler for instance) you will see that q is necessarily in the middle of p and r (since they are separated appart by the same constant).
This is what this answer says.
For a geometric sequence, the same observation holds, except on a logarithmic scale, if you look at the answer and take the logarithm, you will see this is exactly the same formula.

Cheers...
 
  • #4
Thanks for the help I think I get it now!
 

FAQ: Pascals Triangle, arithmetic sequence.

What is Pascals Triangle?

Pascal's Triangle is a triangular arrangement of numbers that was discovered by Blaise Pascal, a French mathematician, in the 17th century. It is formed by starting with a 1 at the top, and then each subsequent row is created by adding the two numbers above it.

How is Pascals Triangle related to arithmetic sequence?

Pascal's Triangle is closely related to arithmetic sequences because the numbers in each row follow a pattern of adding a constant number to the previous number. The distance between the numbers in each row also follows an arithmetic sequence.

What are the applications of Pascals Triangle?

Pascal's Triangle has many applications in mathematics, including binomial expansion, probability, and combinatorics. It is also used in computer science for various algorithms, such as the binomial heap.

What is the significance of the numbers in Pascals Triangle?

The numbers in Pascals Triangle have many interesting properties and connections to other areas of mathematics. For example, the numbers in each row represent combinations, and the sum of the numbers in each row is equal to powers of 2. The triangle also contains patterns related to prime numbers and Fibonacci numbers.

Can Pascals Triangle be extended beyond the initial 1s?

Yes, Pascals Triangle can be extended infinitely by continuing the pattern of adding the two numbers above to create the next number in each row. The extended triangle is also known as Pascal's Pyramid.

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