Discussion
One number has been withheld from the end of this sequence. Work out the rule and supply the missing number.
90, 84, 78, 72, ?
Answer: B
Correct answer: 66
Every gap is the same: the differences run -6, -6, -6, so the common difference is -6. Applying it once more to the final term, 72 - 6 gives 66. As a check, subtracting -6 from the answer returns 72, the term before it, and repeating that recovers the whole series. A falling series is handled exactly as a rising one, with a negative difference, and the arithmetic is safer if the sign is written down explicitly.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development