What number will replace the ?
$11, 10, ?, 100, 1001, 1000, 10001$

101

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110

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111

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None of these

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Solution

The correct option is B $101$
The pattern is 1, $\times 10 + 1$ , 1, $\times 10 + 1$ , 1, $\times 10 + 1$ , .....
So, missing term $= 10 \times 10 + 1 = 101$
Hence,option A is the correct answer.

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