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TGPSC Group-I 2024 · Question 135 of 144

Find the next number in the following series : 1, 3, 15, 45, 101, 191, ______

Mental Ability

  1. A320
  2. B321
  3. C322
  4. D323Correct

Answer: D. 323

Explanation

Differences: 2, 12, 30, 56, 90 — second differences 10, 18, 26, 34 grow by 8, so next difference is 132; 191 + 132 = 323.

Source: TGPSC Group-I Preliminary Test 2024 official question paper booklet (held 9 Jun 2024, TEST 224) with Preliminary Key (MASTER), via Adda247

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