Directions: In the following question, a number sequence is given with one term missing. Choose the correct term that will continue the same pattern and replace the question mark in the given sequence.2,7,5,5,8,3,11,?
Correct answer: A. 1
- A. 1
- B. 0
- C. 2
- D. 3
Explanation
The sequence 2, 7, 5, 5, 8, 3, 11, ? can be broken into two interleaved subsequences: Odd-position terms: 2, 5, 8, 11 - This subsequence increases by 3 each step.Even-position terms: 7, 5, 3, ? - This subsequence decreases by 2 each step.By continuing the pattern for the even-position terms: 7, 5, 3, each step reduces by 2, resulting in the missing term being 1.Other options do not follow these patterns: 0 or 2 would alter the established decrease by 2, and 3 would incorrectly repeat the last known term.Final Answer: 1
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About Alcohols and Phenols
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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