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An arithmetic sequence has first term \(P_{0}=1\) and common difference \(d=9\) (a) The number 2701 is which term of the arithmetic sequence? (b) Find \(1+10+19+\cdots+2701\).

Short Answer

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(a) The number 2701 is the 300th term of the sequence. (b) The sum of the series up to 2701 is 405300.

Step by step solution

01

Calculate the Position of 2701 in the Sequence

The formula of the nth term of an arithmetic progression is \(P_{n}=P_{0}+n*d\). We substitute \(P_{0}=1\), \(d=9\), and \(P_{n}=2701\) into the formula and solve the equation for \(n\): 2701 = 1 + d*n. Solving for \(n\) gives \(n = (2701 - 1)/9 = 300\).
02

Find the Sum up to 2701

The sum of the terms of an arithmetic progression can be found using the formula \(S_{n}=n/2*(P_{0}+P_{n})\). We substitute \(n=300\), \(P_{0}=1\), and \(P_{n}=2701\) into the formula: \(S_{300} = (300/2) * (1 + 2701) = 405300\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Arithmetic Progression
An arithmetic progression, or arithmetic sequence, is a sequence of numbers in which the difference between consecutive terms is constant. This difference is essential to understand and is referred to as the "common difference."

In an arithmetic sequence, if you know the first term and the common difference, you can effortlessly predict any subsequent term by repeatedly adding the common difference to the previous term:
  • If the first term is 1 and the common difference is 9, then the sequence begins as 1, 10, 19, 28, and so on.
  • This pattern continues indefinitely as long as you keep adding the common difference to the previous term.

Arithmetic progressions are everywhere in mathematics and everyday life. You may encounter them in finance, time series analysis, or even while planning a schedule with evenly spaced events. Understanding this sequence sets the foundation for exploring more complex mathematical patterns.
nth Term Formula
In an arithmetic sequence, the nth term can be calculated using a specific formula. This formula gives the value of any term in the sequence once you know the first term and the common difference.

The nth term formula is: \[P_{n} = P_{0} + (n-1) * d\]where:
  • \(P_{n}\) is the nth term that you want to find
  • \(P_{0}\) is the first term of the sequence
  • \(d\) is the common difference
  • \(n\) is the position of the term in the sequence
Using this formula, you can determine that the number 2701 is the 300th term in the sequence, as shown in the original solution. This formula is a handy tool and can help solve various problems related to arithmetic sequences quickly and efficiently.
Common Difference
The common difference in an arithmetic sequence is the difference between any two successive terms. It remains constant throughout the entire sequence. This is what makes the sequence "arithmetic."

To find the common difference:
  • Take any term in the sequence and subtract its preceding term.
  • For example, if the sequence starts as 1, 10, 19, 28, the common difference is \(10 - 1 = 9\).
Understanding the common difference is crucial for making sense of arithmetic sequences. It allows you to accurately and consistently generate the subsequent terms and use formulas effectively. Whether you're dealing with growth patterns or uniform designs, recognizing the common difference is a key step.
Sum of Terms
Finding the sum of terms of an arithmetic sequence is straightforward thanks to a well-defined formula. This formula lets you quickly determine the sum of all numbers up to a certain term in the sequence.

The sum of the first n terms, represented as \(S_n\), is given by:\[S_{n} = \frac{n}{2} * (P_{0} + P_{n})\]Here:
  • \(S_n\) is the sum of the first n terms
  • \(n\) is the number of terms
  • \(P_{0}\) is the first term of the sequence
  • \(P_{n}\) is the nth term
So, if you wanted to find the sum of the sequence from 1 to 2701, you would substitute the values outlined in the original solution to reach 405300. This formula is extremely useful in quickly calculating large sums without having to add each number individually.

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Most popular questions from this chapter

Airlines would like to board passengers in the order of decreasing seat numbers (largest seat number first, second largest next, and so on), but passengers don't like this policy and refuse to go along. If two passengers randomly board a plane the probability that they board in order of decreasing seat numbers is \(\frac{1}{2}\), if three passengers randomly board a plane the probability that they board in order of decreasing seat numbers is \(\frac{1}{6} ;\) if four passengers randomly board a plane the probability that they board in order of decreasing seat numbers is \(\frac{1}{24}\); and if five passengers randomly board a plane, the probability that they board in order of decreasing seat numbers is \(\frac{1}{120}\). Using the sequence \(\frac{1}{2}, \frac{1}{6}, \frac{1}{24}, \frac{1}{120}, \ldots\) as your guide, (a) determine the probability that if six passengers randomly board a plane they board in order of decreasing seat numbers. (b) determine the probability that if 12 passengers randomly board a plane they board in order of decreasing seat numbers

A population decays according to an exponential growth model, with \(P_{0}=3072\) and common ratio \(R=0.75 .\) (a) Find \(P_{5}\). (b) Give an explicit formula for \(P_{N}\). (c) How many generations will it take for the population

Consider the sequence \(2,3,5,9,17,33, \ldots\) (a) List the next two terms of the sequence. (b) Assuming the sequence is denoted by \(A_{1}, A_{2}, A_{3}, \ldots\), give an explicit formula for \(A_{N}\). (c) Assuming the sequence is denoted by \(P_{0}, P_{1}, P_{2}, \ldots\). give an explicit formula for \(P_{N}\).

Find the sum (a) \(1+3+3^{2}+3^{3}+\cdots+3^{10}\) (b) \(1+3+3^{2}+3^{3}+\cdots+3^{N-1}\). (Hint: The answer is an expression in \(N\).)

Consider the sequence defined by the explicit formula \(A_{N}=\frac{2 N+3}{3 N-1}\) (a) Find \(A_{1}\). (b) Find \(A_{100}\) - (c) Suppose \(A_{N}=1 .\) Find \(N\).

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