Series & Patterns
123 questions available
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Q21.Complete the sequence: 2 / 4 → 4 / 16 → 16 / 256 → ?
Correct Answer: A
Each numerator is the square of the previous numerator: 2^2=4, 4^2=16, 16^2=256. Each denominator is the square of the previous denominator: 4^2=16, 16^2=256, 256^2=65536. So, the next term is 256 / 65536.
Q22.What is the next number in the series: 15, 45, 75, 105?
Correct Answer: C
The difference between consecutive terms is constant at +30. The next term is 105 + 30 = 135.
Q23.What is the next number in the sequence: 15, 30, 45, ____?
Correct Answer: B
The sequence increases by +15 each time. The next term is 45 + 15 = 60.
Q24.Complete the series: 43, 53, 63, ____?
Correct Answer: B
The terms increase by a constant difference of +10. The next term is 63 + 10 = 73.
Q25.What is the next number in this sequence: 1, 3, ____, 7, 11?
Correct Answer: A
The sequence is 1, 3, 5, 7, 11. It consists of numbers increasing by 2 (odd numbers) but 9 is skipped, or alternatively, differences are +2, +2, +2, +4. The missing term is 5.
Q26.Complete the series: 3 | 3 | 3 | 6 | 3 | 9 | 3 | ____?
Correct Answer: C
The series alternates: 3 is placed at odd positions (1st, 3rd, 5th, 7th). The numbers at even positions (2nd, 4th, 6th) increase by 3: 3 -> 6 -> 9. The next even-positioned term should be 9 + 3 = 12.
Q27.Complete the series: 1, 5, 9, 13, 17, 21, ____?
Correct Answer: C
The series increases by a constant difference of +4. The next term is 21 + 4 = 25.
Q28.What is the next term in the sequence: 486, 162, 54, 18, 6, ____?
Correct Answer: B
Each term is divided by 3 to yield the next term: 486/3=162, 162/3=54, 54/3=18, 18/3=6. The next term is 6/3 = 2.
Q29.What will come in the sequence: 6 : ? : 60 : 120 : 12?
Correct Answer: C
Looking at the options, the sequence uses alternating patterns. The number 12 fits the sequence.
Q30.Which of the following sequences is similar to 77677, 76767, 77767?
Correct Answer: D
The target sequence has 76767 in the second position and 77767 in the third. Option D (7677: 76767: 77767) maintains this exact internal pattern in its second and third parts.
Q31.Find the incorrect number in the sequence: 54, 43, 34, 26, 22, 19, 18
Correct Answer: B
The pattern subtracts decreasing odd numbers: 54-11=43, 43-9=34, 34-7=27, 27-5=22, 22-3=19, 19-1=18. Thus, 26 is wrong and should be 27.
Q32.What comes next in the sequence 1, 1, 2, 3, 5, 8, 13?
Correct Answer: A
This is the Fibonacci sequence. Each term is the sum of the preceding two terms: 8 + 13 = 21.
Q33.What comes next in the sequence 4, 9, 19, 39, ...?
Correct Answer: B
The pattern is (term * 2) + 1. Thus: 4*2+1=9, 9*2+1=19, 19*2+1=39. The next term is 39*2+1 = 79.
Q34.Complete the series: 9P0145, 90159, ...?
Correct Answer: C
Ignoring the letter 'P', the numeric values increase by 14: 90145 + 14 = 90159. The next term is 90159 + 14 = 90173.
Q35.Find the missing letters in the series: AD, DF, EH, _?
Correct Answer: D
First letter: A(+3)->D(+1)->E(+2)->G. Second letter: D(+2)->F(+2)->H(+2)->J. The missing pair is GJ.
Q36.Which option follows the same pattern in the series: HGF, WVU, EDC, _?
Correct Answer: C
Each term is 3 consecutive letters written in reverse alphabetical order: HGF, WVU, EDC. The only option following this is CAB.
Q37.What is the missing number in the series: 459, 440, ?, 402, 383?
Correct Answer: B
The pattern is a constant subtraction of 19: 459 - 19 = 440. Next is 440 - 19 = 421. Check: 421 - 19 = 402, and 402 - 19 = 383.
Q38.Which number comes next in the series: 10, 34, 50, 68, 88, ?
Correct Answer: D
Differences: 34-10=24, 50-34=16, 68-50=18, 88-68=20. The differences after 24 increase sequentially: 16, 18, 20. The next difference should be 22. Next term = 88 + 22 = 110.
Q39.What is the missing number in the sequence: 4, 6, 10, 18, …… , 66?
Correct Answer: C
Differences are powers of 2: +2, +4, +8, +16, +32. Thus: 18 + 16 = 34. Check: 34 + 32 = 66.
Q40.If 3 = 6, 4 = 12, 5 = 20, 6 = 30 then 7 = ?
Correct Answer: D
The pattern is: n → n × (n − 1). 3 × 2 = 6, 4 × 3 = 12, 5 × 4 = 20, 6 × 5 = 30, so 7 × 6 = 42.