Direction: Find the missing series?

12, 18, 36, 90, 270, ?

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RRB Clerk Prelims Memory Based Paper (Held On: 17 August 2024 Shift 2)
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  1. 850
  2. 945
  3. 670
  4. 430
  5. 780

Answer (Detailed Solution Below)

Option 2 : 945
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Detailed Solution

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Calculation:

18 ÷ 12 = 1.5

36 ÷ 18 = 2

90 ÷ 36 = 2.5

270 ÷ 90 = 3

The factors between consecutive terms are increasing by 0.5 each time: 1.5, 2, 2.5, 3.

To find the next term, multiply 270 by 3.5 (since the next factor should be 3.5):

270 × 3.5 = 945

∴ The missing term in the series is 945.

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