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Write the repeating decimal as a fraction.\newline.002002002.002002002

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Q. Write the repeating decimal as a fraction.\newline.002002002.002002002
  1. Identify Repeating Pattern: Identify the repeating pattern in the decimal.\newlineThe repeating pattern is 002002, which repeats indefinitely after the decimal point.
  2. Express as Infinite Sum: Express the repeating decimal as an infinite sum of its repeating parts.\newline0.002002002=0.002+0.000002+0.000000002+0.002002002\ldots = 0.002 + 0.000002 + 0.000000002 + \ldots
  3. Convert to Fractions: Convert each term of the sum into a fraction.\newline0.002=210000.002 = \frac{2}{1000}, 0.000002=210000000.000002 = \frac{2}{1000000}, 0.000000002=210000000000.000000002 = \frac{2}{1000000000}, and so on.
  4. Recognize Geometric Series: Recognize that the sum forms a geometric series with the first term a1=21000a_1 = \frac{2}{1000} and the common ratio r=11000r = \frac{1}{1000}.
  5. Use Sum Formula: Use the formula for the sum of an infinite geometric series, S=a11rS = \frac{a_1}{1 - r}, to write the repeating decimal as a fraction.\newlineSubstitute a1=21000a_1 = \frac{2}{1000} and r=11000r = \frac{1}{1000} into the formula.\newlineS=(21000)111000S = \frac{\left(\frac{2}{1000}\right)}{1 - \frac{1}{1000}}
  6. Simplify Expression: Simplify the expression by performing the operations.\newlineS=21000/9991000S = \frac{2}{1000} / \frac{999}{1000}\newlineS=21000×1000999S = \frac{2}{1000} \times \frac{1000}{999}\newlineS=2999S = \frac{2}{999}

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