find decimal expansion of 1/7 and with its help . find decimal expansion of 2/7 and 4/7.
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Answer: 1/7 = 0.142857
2 × 1/7 = 2/7
=> 2 × 0.142857 = 2/7
=> 2/7 = 0.285714
4 × 7 = 4/7
=> 4/7 = 4 × 0.142857
=> 4/7 = 0.571428
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