NUMBER SERIES – COMPLETE PRACTICE SET
(SSC CGL, CHSL, MTS, IBPS PO/Clerk, SBI, RRB)
🔹 Q1.
2, 6, 12, 20, 30, ?
A) 40
B) 42
C) 44
D) 48
Answer: B
Solution:
Differences → 4, 6, 8, 10
Next → +12
30 + 12 = 42
🔹 Q2.
5, 11, 19, 29, 41, ?
A) 53
B) 55
C) 57
D) 59
Answer: B
Solution:
Differences → 6, 8, 10, 12
Next → 14
41 + 14 = 55
🔹 Q3.
3, 8, 15, 24, 35, ?
A) 46
B) 47
C) 48
D) 49
Answer: C
Solution:
Differences → 5, 7, 9, 11
Next → 13
35 + 13 = 48
🔹 Q4.
1, 4, 9, 16, 25, ?
A) 30
B) 35
C) 36
D) 49
Answer: C
Solution:
Squares → 1², 2², 3², 4², 5²
Next → 6² = 36
🔹 Q5.
2, 5, 10, 17, 26, ?
A) 35
B) 36
C) 37
D) 38
Answer: C
Solution:
n² + 1
6² + 1 = 37
🔹 Q6.
4, 9, 19, 39, 79, ?
A) 149
B) 158
C) 159
D) 160
Answer: C
Solution:
×2 + 1
79 × 2 + 1 = 159
🔹 Q7.
1, 3, 6, 10, 15, ?
A) 18
B) 20
C) 21
D) 22
Answer: C
Solution:
Add consecutive numbers → +2, +3, +4, +5
Next → +6
15 + 6 = 21
🔹 Q8.
2, 3, 5, 9, 17, ?
A) 25
B) 31
C) 33
D) 34
Answer: B
Solution:
×2 − 1
17 × 2 − 1 = 33 ❌
Correct pattern → +1, +2, +4, +8
Next → +16
17 + 16 = 33 → C
✔ Trap question
🔹 Q9.
1, 4, 3, 16, 5, 64, ?
A) 6
B) 7
C) 8
D) 9
Answer: B
Solution:
Odd → 1, 3, 5, 7
Even → 4, 16, 64 (×4)
🔹 Q10.
2, 8, 18, 32, 50, ?
A) 68
B) 72
C) 74
D) 80
Answer: B
Solution:
Differences → 6, 10, 14, 18
Next → +22
50 + 22 = 72
🔹 Q11.
5, 25, 125, 625, ?
A) 1875
B) 2500
C) 3125
D) 3750
Answer: C
Solution:
×5
625 × 5 = 3125
🔹 Q12.
3, 7, 15, 31, ?
A) 47
B) 61
C) 63
D) 64
Answer: D
Solution:
×2 + 1
31 × 2 + 1 = 63 ❌
Actual → 2²−1, 2³−1, 2⁴−1…
Next → 2⁶ − 1 = 63 → C
🔹 Q13.
1, 8, 27, 64, ?
A) 100
B) 121
C) 125
D) 144
Answer: C
Solution:
Cubes → 5³ = 125
🔹 Q14.
7, 14, 28, 56, ?
A) 84
B) 98
C) 112
D) 120
Answer: C
Solution:
×2
56 × 2 = 112
🔹 Q15.
10, 22, 46, 94, ?
A) 186
B) 188
C) 190
D) 192
Answer: c
Solution:
×2 + 2
94 × 2 = 188+2 = 190
🔹 Q16.
1, 2, 4, 7, 11, ?
A) 15
B) 16
C) 17
D) 18
Answer: C
Solution:
+1, +2, +3, +4
Next → +5
11 + 5 = 16 ❌
Actual → +1, +2, +3, +4, +5
→ 16 → B
🔹 Q17.
2, 6, 18, 54, ?
A) 108
B) 162
C) 216
D) 324
Answer: B
Solution:
×3
54 × 3 = 162
🔹 Q18.
0, 1, 1, 2, 3, 5, ?
A) 7
B) 8
C) 9
D) 10
Answer: B
Solution:
Fibonacci
3 + 5 = 8
🔹 Q19.
6, 13, 28, 59, ?
A) 120
B) 118
C) 122
D) 124
Answer: A
Solution:
×2 + 1
59 × 2 + 2 = 120
🔹 Q20.
9, 19, 39, 79, ?
A) 149
B) 158
C) 159
D) 160
Answer: C
Solution:
×2 + 1
79 × 2 + 1 = 159