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Series Completion - Verbal and Reasoning

Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Q1:

11, 10, ?, 100, 1001, 1000, 10001

A 101

B 110

C 111

D None of these

ANS:A - 101

Explanation: The pattern is - 1, x 10 + 1, - 1, x 10 + 1, - 1, x 10 + 1, ..... So, missing term = 10 x 10 + 1 = 101.