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Question

What is the next number in the series?
1, 3, 9, 27, ___

This question was previously asked in
SSC CGL 2025 Tier 2 Paper 1 Question Paper (19-Jan-2026)
The correct answer is
81

Next Number Series Calculation

To find the next number in the series 1, 3, 9, 27, we need to identify the pattern.

  • Observe the relationship between consecutive terms:
    • $3 \div 1 = 3$
    • $9 \div 3 = 3$
    • $27 \div 9 = 3$
  • The pattern is that each number is obtained by multiplying the previous number by 3. This is a geometric progression with a common ratio of 3.

Finding the Next Term

Apply the identified pattern to the last term (27):

Next Term = Last Term $\times$ Common Ratio

Next Term = $27 \times 3$

Next Term = $81$

Therefore, the next number in the series is 81.

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