Problem

Evaluate the Summation sum from i=1 to 4 of (1/3)^(i-1)

The question asks you to calculate the total sum of a series where each term is given by the expression (1/3)^(i-1), with i ranging from 1 to 4. This means you need to substitute i values 1, 2, 3, and 4 into the given expression, calculate each term, and then sum these terms to get the final result.

i=14((13))i1

Answer

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Solution:

Step:1

Write out the terms of the summation for i ranging from 1 to 4.

(13)11+(13)21+(13)31+(13)41

Step:2

Proceed to simplify the expression.

Step:2.1

Evaluate each term individually.

Step:2.1.1

Calculate 11.

(13)0+(13)21+(13)31+(13)41

Step:2.1.2

Apply the exponent rule to 13.

1030+(13)21+(13)31+(13)41

Step:2.1.3

Recognize that any number to the power of 0 equals 1.

130+(13)21+(13)31+(13)41

Step:2.1.4

Simplify the first term to 1.

1+(13)21+(13)31+(13)41

Step:2.1.5

Evaluate 21.

1+(13)1+(13)31+(13)41

Step:2.1.6

Simplify the second term.

1+13+(13)31+(13)41

Step:2.1.7

Calculate 31.

1+13+(13)2+(13)41

Step:2.1.8

Apply the exponent rule to the third term.

1+13+1232+(13)41

Step:2.1.9

Simplify the third term.

1+13+132+(13)41

Step:2.1.10

Evaluate 41.

1+13+19+(13)3

Step:2.1.11

Apply the exponent rule to the fourth term.

1+13+19+1333

Step:2.1.12

Simplify the fourth term.

1+13+19+133

Step:2.1.13

Combine the simplified terms.

1+13+19+127

Step:2.2

Find a common denominator for the fractions.

Step:2.2.1

Express 1 as a fraction with denominator 27.

2727+13+19+127

Step:2.2.2

Convert 13 to have the common denominator 27.

2727+927+19+127

Step:2.2.3

Convert 19 to have the common denominator 27.

2727+927+327+127

Step:2.2.4

Combine the fractions over the common denominator.

27+9+3+127

Step:2.3

Add the numerators.

4027

Step:3

Present the final result in various forms.

Exact Form: 4027 Decimal Form: 1.4815... Mixed Number Form: 11327

Knowledge Notes:

This problem involves evaluating a finite geometric series, which is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio. In this case, the common ratio is 13.

The steps of the solution involve:

  1. Expanding the series based on the given summation limits.

  2. Simplifying each term by applying exponent rules, such as any number to the power of zero equals one.

  3. Finding a common denominator to combine the terms, which is necessary when adding fractions with different denominators.

  4. Adding the numerators over the common denominator to find the sum of the series.

  5. Presenting the result in various forms, including exact fraction, decimal, and mixed number forms.

This problem also illustrates the importance of understanding the properties of exponents and the process of adding fractions, which are fundamental concepts in algebra.

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