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11, 10,( ),100, 1001,1001, 10001 (a) 101 (b) 110 (c) 111 (d)?

Aptitude Quizzes Mathematics Aptitude Test

Question:
11, 10,( ),100, 1001,1001, 10001 (a) 101 (b) 110 (c) 111 (d)

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

Correct Answer is Option B):
101

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