CSEET – Sequence & Series multiple choice questions with answers and explanations

CSEET – Sequence & Series multiple choice questions with answers and explanations

Q1.Find the next number in the series:2, 5, 10, 17, 26, ?

A. 35B. 37C. 38D. 45

Answer: B. 37Explanation:Differences = 3, 5, 7, 9 → next difference = 11 → 26 + 11 = 37

Q2. Find the missing number:3, 6, 12, 24, 48, ?

A. 72B. 96C. 100D. 120

Answer: B. 96Explanation:Each term ×2 → Next = 48×2 = 96

Q3.Find the next term:1, 4, 9, 16, 25, ?

A. 30B. 36C. 49D. 64

Answer: B. 36Explanation:Perfect squares → 1², 2², 3², 4², 5² → next is 6² = 36

Q4.Find the missing term:1, 1, 2, 3, 5, 8, 13, ?

A. 18B. 20C. 21D. 22

Answer: C. 21Explanation:Fibonacci series: each term = sum of previous two → 8+13 = 21

Q5.Find the wrong term in the series:4, 8, 16, 32, 64, 130

A. 8B. 16C. 130D. 64

Answer: C. 130Explanation:Pattern ×2 → correct term should be 128 (not 130).

Q6.Find the next number:5, 10, 20, 40, 80, ?

A. 100B. 120C. 160D. 200

Answer: C. 160Explanation:Each term ×2 → Next = 80×2 = 160

Q7.Find the missing term:1, 3, 6, 10, 15, 21, ?

A. 27B. 28C. 29D. 30

Answer: B. 28Explanation:Triangular numbers (add +2, +3, +4, +5, +6, +7).Next = 21+7 = 28

Q8.Find the next term in the series:2, 6, 12, 20, 30, ?

A.  36B. 40C. 42D. 44

Answer: C. 42Explanation:Differences = 4, 6, 8, 10 → next = 12 → 30 + 12 = 42

Q9.Find the missing number:11, 22, 44, 88, ?

A. 99B. 132C. 176D. 198

Answer: C. 176Explanation:Each term ×2 → Next = 88×2 = 176

Q10. Find the next number:100, 81, 64, 49, 36, ?

A. 25B. 30C. 32D. 20

Answer: A. 25Explanation:Squares in reverse → 10², 9², 8², 7², 6² → next is 5² = 25

Q11.Find the next term:3, 6, 9, 15, 24, 39, ?

A. 48B. 54C. 63D. 64

Answer: C. 63Explanation:Differences = 3, 3, 6, 9, 15 → next difference = 24 → 39 + 24 = 63

Q12.Find the missing term:5, 10, 17, 26, 37, ?

A. 48B. 50C. 51D. 52

Answer: C. 51Explanation:Differences = 5, 7, 9, 11 → next = 13 → 37+13 = 51

Q13.Find the missing number:1, 8, 27, 64, ?

A. 100B. 121C. 125D. 216

Answer: C. 125Explanation:Cubes → 1³, 2³, 3³, 4³ → next is 5³ = 125

Q14.Find the next number:13, 26, 39, 52, 65, ?

A. 70B. 78C. 80D. 90

Answer: B. 78Explanation:Each term increases by +13 → Next = 65 + 13 = 78

Q15.Find the missing term:2, 3, 5, 8, 12, 17, ?

A. 21B. 22C. 23D. 24

Answer: B. 23Explanation:Differences = 1, 2, 3, 4, 5 → next difference = 6 → 17+6 = 23