CA Foundation · Quantitative Aptitude · Number Series, Coding-Decoding and Odd Man Out
Find the missing number in the series 2, 6, 18, 54, ?, 486.
Each term is three times the term before it. Multiplying 54 by 3 gives 162, and multiplying 162 by 3 gives 486, which matches the last term. So the missing number is 162.
- A108
- B148
- C162Correct
- D216
Explanation
Each term is 3 times the previous one: 2, 6, 18, 54. So the missing term is 54 × 3 = 162, and 162 × 3 = 486 confirms it. The option 108 comes from doubling 54.
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