Q1. Find the next term in the series: 3, 6, 9, 12, ?
A) 13
B) 14
C) 15
D) 16
Answer: C) 15
Explanation: The pattern is a constant difference series. Each term increases by +3 (3→6→9→12). So, the next term is 12 + 3 = 15.
Q2. Find the missing term in the series: 5, 10, 20, __, 80
A) 30
B) 35
C) 40
D) 45
Answer: C) 40
Explanation: Each term is multiplied by 2.
5×2=10, 10×2=20, so the next is 20×2=40, and 40×2=80. The missing term is 40.
Q3. Find the next term in the series: 1, 4, 9, 16, ?
A) 20
B) 25
C) 24
D) 27
Answer: B) 25
Explanation: These are perfect squares:
1²=1, 2²=4, 3²=9, 4²=16. The next is 5² = 25.
Q4. Find the next term in the series: 2, 5, 11, 23, ?
A) 45
B) 46
C) 47
D) 48
Answer: C) 47
Explanation: The pattern is “multiply by 2 and add 1.”
2×2+1=5, 5×2+1=11, 11×2+1=23.
So, next = 23×2+1 = 46+1 = 47.
Q5. Find the missing term in the series: 1, 4, 7, __, 13, 16
A) 8
B) 9
C) 10
D) 11
Answer: C) 10
Explanation: This is an arithmetic series with a constant difference of +3.
1→4 (+3), 4→7 (+3), so 7→10 (+3), then 10→13 (+3), 13→16 (+3). The missing term is 10.
Q6. Find the next term in the series: 20, 25, 23, 28, 26, ?
A) 29
B) 31
C) 30
D) 33
Answer: C) 30
Explanation: The pattern alternates +5 and −2.
20+5=25, 25−2=23, 23+5=28, 28−2=26, so next = 26+5 = 30.
Q7. Find the next term in the series: 4, 7, 11, 16, 22, ?
A) 27
B) 28
C) 29
D) 30
Answer: C) 29
Explanation: Look at the differences:
7−4=3, 11−7=4, 16−11=5, 22−16=6.
The differences increase by 1 each time, so next difference is 7.
Next term = 22 + 7 = 29.
Q8. Find the next term in the series: 1, 8, 27, 64, ?
A) 100
B) 121
C) 125
D) 144
Answer: C) 125
Explanation: These are cubes:
1³=1, 2³=8, 3³=27, 4³=64. The next is 5³ = 125.
Q9. Find the next term in the series: 1, 1, 2, 3, 5, ?
A) 6
B) 7
C) 8
D) 9
Answer: C) 8
Explanation: This is the Fibonacci pattern where each term is the sum of the previous two.
1+1=2, 1+2=3, 2+3=5, so next = 3+5 = 8.
Q10. Find the next term in the series: 12, 16, 20, 24, ?
A) 26
B) 27
C) 28
D) 30
Answer: C) 28
Explanation: The pattern is a constant difference of +4.
12+4=16, 16+4=20, 20+4=24, so next = 24+4 = 28.
Q11. Find the wrong term in the series: 6, 12, 18, 25, 30
A) 12
B) 18
C) 25
D) 30
Answer: C) 25
Explanation: The expected pattern is adding +6 each time:
6, 12, 18, 24, 30.
But the series has 25 instead of 24, so 25 is the wrong term.
Q12. Find the wrong term in the series: 1, 4, 9, 15, 25
A) 4
B) 9
C) 15
D) 25
Answer: C) 15
Explanation: These should be perfect squares: 1, 4, 9, 16, 25.
The term 15 is not a square and breaks the pattern. The correct term should be 16, so 15 is the wrong term.
Q13. Find the next term in the series: 100, 90, 81, 73, ?
A) 65
B) 66
C) 67
D) 68
Answer: B) 66
Explanation: The differences are decreasing by 1 each time:
100→90 (−10), 90→81 (−9), 81→73 (−8).
So next difference is −7. Therefore, next term = 73 − 7 = 66.
Q14. Find the next term in the series: 2, 3, 5, 7, 11, ?
A) 12
B) 13
C) 14
D) 15
Answer: B) 13
Explanation: These are prime numbers in order: 2, 3, 5, 7, 11.
The next prime number after 11 is 13.
Q15. Find the next term in the series: 9, 18, 16, 32, 30, ?
A) 58
B) 60
C) 62
D) 64
Answer: B) 60
Explanation: The pattern alternates “×2” and “−2.”
9×2=18, 18−2=16, 16×2=32, 32−2=30, so next = 30×2 = 60.
Q16. Find the missing term in the series: 11, 22, __, 44, 55
A) 30
B) 31
C) 33
D) 35
Answer: C) 33
Explanation: The pattern is adding 11 each time (or multiples of 11).
11, 22, 33, 44, 55. So the missing term is 33.
Q17. Find the next term in the series: 7, 14, 15, 30, 31, ?
A) 60
B) 61
C) 62
D) 63
Answer: C) 62
Explanation: The pattern alternates “×2” and “+1.”
7×2=14, 14+1=15, 15×2=30, 30+1=31, so next = 31×2 = 62.
Q18. Find the next term in the series: 10, 11, 13, 16, 20, ?
A) 23
B) 24
C) 25
D) 26
Answer: C) 25
Explanation: Check the differences:
11−10=1, 13−11=2, 16−13=3, 20−16=4.
The differences increase by 1, so next difference is 5.
Next term = 20 + 5 = 25.
Q19. Find the next term in the series: 1, 2, 4, 7, 11, ?
A) 14
B) 15
C) 16
D) 17
Answer: C) 16
Explanation: Look at the differences:
2−1=1, 4−2=2, 7−4=3, 11−7=4.
The differences increase by 1 each time, so next difference is 5.
Next term = 11 + 5 = 16.
Q20. Find the next term in the series: 2, 6, 12, 20, 30, ?
A) 40
B) 41
C) 42
D) 44
Answer: C) 42
Explanation: The differences are:
6−2=4, 12−6=6, 20−12=8, 30−20=10.
These differences increase by +2 each time, so next difference is 12.
Next term = 30 + 12 = 42.