Multiple choice

Find the missing term ‘?’ of the following series. $11, 29, 83, 245, 731, ?$

  1. $1881$
  2. $2020$
  3. $1562$
  4. $1992$
  5. $2189$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Pattern: each term is 3^n + 2. 3^1 + 2 = 5 (but series starts with 11). Testing: 3^2 + 2 = 11; 3^3 + 2 = 29; 3^4 + 2 = 83; 3^5 + 2 = 245; 3^6 + 2 = 731; 3^7 + 2 = 2187. Option E is 2189, which doesn't match. Alternative pattern: 11 × 3 - 4 = 29; 29 × 3 - 4 = 83; 83 × 3 - 4 = 245; 245 × 3 - 4 = 731; 731 × 3 - 4 = 2189.

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