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.3,9,15,?
Correct answer: A. 21
- A. 21
- B. 33
- C. 31
- D. 30
Explanation
The sequence given is 3, 9, 15, ?. By examining the differences between consecutive terms, we observe that:9 - 3 = 615 - 9 = 6The difference between each pair of terms is consistent: 6. This suggests an arithmetic sequence with a common difference of 6. Therefore, to find the missing term, we add 6 to the last known term:15 + 6 = 21Thus, the missing term is 21.Options 33, 31, and 30 are incorrect because they do not follow the established arithmetic pattern of adding 6 to the previous term.
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About Letter, Symbol and Number Series
Series questions use numbers, letters, symbols or combinations arranged according to a hidden pattern. You may need to identify repeated operations, alternating rules, alphabetical positions, differences, reversals and mixed sequences to find a missing term or predict the next one.
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