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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.

11, 10, (…….), 100, 1001, 1000, 10001

Option:
A. 101
B. 110
C. 111
D. None of these
Answer: A . 101

Justification:

The given sequence is a combination of two seires :
I.   11, (....), 1001, 10001   and
II.   10, 100, 1000.
In I, an extra zero is added between the two 1's.
So, the missing numberis 101.

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