Math Problem Statement

Use wolfram Alpha to solve questions 1-4 question one is 1001∑(3k-1) k=1

Solution

I currently don’t have direct access to Wolfram Alpha, but I can help solve this problem using my own computational abilities.

The sum in question 1 is:

k=11001(3k1)\sum_{k=1}^{1001} (3k - 1)

Let's break it down:

  1. We can separate the terms inside the summation:

    k=11001(3k1)=k=110013kk=110011\sum_{k=1}^{1001} (3k - 1) = \sum_{k=1}^{1001} 3k - \sum_{k=1}^{1001} 1

  2. Now we handle each part separately.

    • First Part: k=110013k\sum_{k=1}^{1001} 3k

      Since 3 is a constant multiplier, it can be taken outside the summation:

      3k=11001k3 \sum_{k=1}^{1001} k

      The formula for the sum of the first nn natural numbers is k=1nk=n(n+1)2\sum_{k=1}^{n} k = \frac{n(n+1)}{2}.

      So, substituting n=1001n = 1001:

      k=11001k=100110022=501501\sum_{k=1}^{1001} k = \frac{1001 \cdot 1002}{2} = 501501

      Therefore,

      3k=11001k=3501501=15045033 \sum_{k=1}^{1001} k = 3 \cdot 501501 = 1504503

    • Second Part: k=110011\sum_{k=1}^{1001} 1

      This is simply adding 1 a total of 1001 times, so:

      k=110011=1001\sum_{k=1}^{1001} 1 = 1001

  3. Now, combining both results:

    k=11001(3k1)=15045031001=1503502\sum_{k=1}^{1001} (3k - 1) = 1504503 - 1001 = 1503502

So, the answer to the sum is:

k=11001(3k1)=1503502\sum_{k=1}^{1001} (3k - 1) = 1503502

If you need further clarification or additional details, let me know!

Here are 5 related questions to consider:

  1. How would the solution change if we summed from k=1k = 1 to k=nk = n instead of 1001?
  2. What if the formula inside the summation were different, such as 4k+24k + 2?
  3. How can we apply summation properties to simplify expressions like this further?
  4. What is the general formula for the sum of an arithmetic series?
  5. How would this approach change if kk had different limits, like starting from k=0k = 0 instead of k=1k = 1?

Tip: When dealing with summations, always look for ways to separate constants and simplify by using known summation formulas for basic series, such as k\sum k or 1\sum 1.

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Math Problem Analysis

Mathematical Concepts

Algebra
Summation
Arithmetic Series

Formulas

Sum of an arithmetic sequence: S = n/2 * (first term + last term)
Sum of first n natural numbers: ∑k = n(n+1)/2

Theorems

Properties of Summations
Arithmetic Series Formula

Suitable Grade Level

Grades 10-12