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How is (3.205\overline{18}) written in ordinary decimal form?

Answer and explanation

Correct answer: (3.205181818\ldots)

The direct answer is option A, 3.205181818… . A bar over digits means exactly those digits repeat forever. The non-repeating part is 205, and the repeating block is 18. Therefore write 3.205 followed by 18 repeatedly: 3.20518181818… . Option A is correct. Option B, 3.20518518…, does not repeat the block 18 continuously. Option C, 3.20518, stops after one occurrence and is not the stated recurring decimal. Option D, 3.20520518…, repeats or inserts the wrong digits before the recurring block. Do not treat the bar as covering 205; it covers only 18.

Related tags

Number-SystemsDecimal-RepresentationBar-Notation

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