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15 Series Questions and Answers

15 solved Series questions with step-by-step explanations. Includes formulas, shortcuts, and tips for placement tests and competitive exams.

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Practice series questions with detailed explanations. These solved examples cover the most frequently asked patterns in placement and competitive exams.

Q1 Easy

Find the next number: 2, 3, 5, 8, 12, ?

  • A. 14
  • B. 16
  • C. 17 ✓
  • D. 18
Explanation: Differences increase by 1 each time starting from +1. Next value is 17.
Q2 Easy

Identify the next term: 5, 8, 12, 17, 23, ?

  • A. 31
  • B. 27
  • C. 29
  • D. 30 ✓
Explanation: Differences increase by 1 each time starting from +3. Next value is 30.
Q3 Easy

Which letter comes next? I, K, M, O, Q, ?

  • A. U
  • B. R
  • C. T
  • D. S ✓
Explanation: Letters progress by +2 position each step. So next is S.
Q4 Easy

Complete the geometric series: 2, 4, 8, 16, 32, ?

  • A. 64 ✓
  • B. 58
  • C. 61
  • D. 67
Explanation: Each term is multiplied by 2. Next term is 64.
Q5 Easy

Identify the next term: 1, 5, 10, 16, 23, ?

  • A. 32
  • B. 28
  • C. 31 ✓
  • D. 30
Explanation: Differences increase by 1 each time starting from +4. Next value is 31.
Q6 Easy

Identify the odd term in the series: 4, 9, 14, 22, 24

  • A. 4
  • B. 19
  • C. 24
  • D. 22 ✓
Explanation: Series should increase by 5. '22' breaks the pattern.
Q7 Medium

What is the next term in GP 3, 6, 12, 24, 48, ?

  • A. 90
  • B. 93
  • C. 99
  • D. 96 ✓
Explanation: Each term is multiplied by 2. Next term is 96.
Q8 Medium

Find the next number: 3, 5, 8, 12, 17, ?

  • A. 23 ✓
  • B. 24
  • C. 20
  • D. 22
Explanation: Differences increase by 1 each time starting from +2. Next value is 23.
Q9 Medium

Identify the odd term in the series: 5, 10, 17, 20, 25

  • A. 5
  • B. 25
  • C. 17 ✓
  • D. 15
Explanation: Series should increase by 5. '17' breaks the pattern.
Q10 Medium

What should come next in this AP? 3, 8, 13, 18, 23, ?

  • A. 24
  • B. 26
  • C. 28 ✓
  • D. 30
Explanation: Common difference is 5. Next = 28.
Q11 Medium

Find the next value (multiplicative pattern): 2, 4, 8, 16, 32, ?

  • A. 61
  • B. 64 ✓
  • C. 67
  • D. 58
Explanation: Each term is multiplied by 2. Next term is 64.
Q12 Hard

Identify the next term: 6, 10, 15, 21, 28, ?

  • A. 33
  • B. 35
  • C. 36 ✓
  • D. 37
Explanation: Differences increase by 1 each time starting from +4. Next value is 36.
Q13 Hard

Find the next term in the alternating series: 6, 16, 9, 19, 12, ?

  • A. 14
  • B. 12 ✓
  • C. 8
  • D. 10
Explanation: Odd and even positions form two APs. Continue the odd-position sequence.
Q14 Hard

What should come next in this AP? 8, 12, 16, 20, 24, ?

  • A. 30
  • B. 28 ✓
  • C. 24
  • D. 26
Explanation: Common difference is 4. Next = 28.
Q15 Hard

Complete the alphabet pattern: H, K, N, Q, T, ?

  • A. W ✓
  • B. Y
  • C. X
  • D. V
Explanation: Letters progress by +3 position each step. So next is W.

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