Exams › IBPS PO › Quantitative Aptitude
What will come in the place of the question mark (?) in the following number series? 9, 45, 180, 540, ?, 1080
- 720
- 900
- 1080
- 1200
Correct answer: 900
Solution
The series follows a pattern of multiplying by 5, 4, 3, and then 2/3: 9 × 5 = 45, 45 × 4 = 180, 180 × 3 = 540. Continuing the pattern gives 540 × 5/3 = 900, and 900 × 6/5 = 1080. So the missing term is 900.
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