Let Number (N) = 0.6666...
N = 0.666.... (1)
Multiply 10 to both sides we get
10N = 6.6666.... (2)
Subtract the first equation(1) from the second(2)
we get,
10N - N = 6.6666.... - 0.6666.....
9N = 6
so, N = 6/9
N = 2/3
Hence 0.6666.... = 2/3 (ANS)
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