Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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discrete structures

**IV. (a) Write using summation notation:**

\[ 1 + \frac{1}{3} + \frac{1}{3^2} + \ldots + \frac{1}{3^n} \]

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**(b) Transform the summation by making the specified change of index variable \( k \) to variable \( j \) using the relationship \( j = k - 1 \):**

\[ \sum_{k=1}^{7} k(k+2)(k-3) \]

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**(c) Write out the first four terms of the summation below. Include at least 4 terms:**

\[ \sum_{j=1}^{n} j(j-1) = \]

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**(d) Compute the product:**

\[ \prod_{j=1}^{4} (-2)^j = \]
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Transcribed Image Text:**IV. (a) Write using summation notation:** \[ 1 + \frac{1}{3} + \frac{1}{3^2} + \ldots + \frac{1}{3^n} \] --- **(b) Transform the summation by making the specified change of index variable \( k \) to variable \( j \) using the relationship \( j = k - 1 \):** \[ \sum_{k=1}^{7} k(k+2)(k-3) \] --- **(c) Write out the first four terms of the summation below. Include at least 4 terms:** \[ \sum_{j=1}^{n} j(j-1) = \] --- **(d) Compute the product:** \[ \prod_{j=1}^{4} (-2)^j = \]
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