Series Questions with Solutions

68 questions44 easy21 medium3 hard

Series questions give a sequence of numbers, letters or a mix of both, and ask you to find the next term, a missing term, or the wrong term. This topic covers number series (based on differences, squares and cubes, multiplication, or mixed operations), letter series, alphanumeric series, and repeating letter patterns. Start by checking the differences between consecutive terms. If those don't show a pattern, check the second differences, ratios, squares and cubes nearby, or whether two separate series alternate. For letter series, convert letters to their alphabet positions and look for the number pattern. With practice, recognising common patterns becomes quick and these questions become reliable marks. Practise the series questions below, each with a step-by-step solution that shows the pattern.

All Questions Easy Medium Hard

Q1.
Find the next term: 2, 4, 7, 14, 17, 34, ____
A. 35B. 36C. 37D. 38
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Q2.
Complete the series: 840, 168, 42, 14, 7, ?
A. 7B. 1C. 6D. None
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Q3.
Find the next term: 1, 4, 9, 16, ___
A. 25B. 18C. 20D. 19
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Q4.
Find the wrong number in the given series: 4, 5, 13, 39, 160, 805
A. 13B. 39C. 5D. 805
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Q5.
What will be the next term in the series? 12, 24, 14, 28, 18, 36, __
A. 26B. 28C. 20D. 16
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Q6.
Find the wrong one: 12, 24, 47, 93, 187, 373, 747
A. 24B. 47C. 93D. 187
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Q7.
Find the next term: 20, 32, 45, 59, 74, …
A. 20B. 90C. 80D. 85
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Q8.
DMC, GNH, JOM, ______
A. MPRB. MPUC. IPUD. MRP
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Q9.
210, 195, 175, 150, 120, ?
A. 100B. 90C. 95D. 85
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Q10.
3, 5, 10, 12, 24, 26, ?
A. 50B. 52C. 46D. 36
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Q11.
Find the next term in the series: KJR, MMP, OPN, QSL, ?
A. MGLB. LKTC. SVJD. ALT
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Q12.
1, 2, 3, 5, 6, 7, 9, 10, 11, __
A. 12B. 14C. 16D. 13
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Q13.
KMO, OQS, SUW, ___ ?
A. WZAB. WYAC. VXZD. None
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Q14.
1, 4, 9, 16, 25, ?
A. 36B. 42C. 35D. 49
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Q15.
Which is the next number in the sequence: 28, 327, 464, 5125, ___?
A. 6216B. 6126C. 6621D. 6612
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Q16.
Look at this series: $53, 53, 40, 40, 27, 27, \dots$ What number should come next?
A. 12B. 14C. 27D. 53
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Q17.
What is the next number in the sequence: $1, 4, 9, 16, 25, ?$
A. 30B. 36C. 42D. 50
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Q18.
Look at this series: $53, 53, 40, 40, 27, 27, \dots$ What number should come next?
A. 12B. 14C. 27D. 53
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Q19.
What is the next number in the sequence: $1, 4, 9, 16, 25, ?$
A. 30B. 36C. 42D. 50
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Q20.
Find the missing number in the series: $3, 9, 27, 81, ?$
A. 162B. 243C. 225D. 256
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