Q20: Find the missing number in the series:
2, 4, 6, 8, ?
Answer: D
Simple arithmetic progression: +2 each time. So next is 10.
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Q115: Find the missing number in the series:
0, 1, 1, 2, 3, 5, ?
Answer: C
Fibonacci series: next number is sum of previous two: 3+5=8.
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Q130: Find the missing number in the series:
121, 144, 169, ?
Answer: B
These are squares of 11, 12, 13... next: 14² = 196.
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Q129: Find the missing number in the series:
2, 4, 6, 8, ?
Answer: A
Simple arithmetic progression: +2 each time. So next is 10.
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Q67: Find the missing number in the series:
121, 144, 169, ?
Answer: C
These are squares of 11, 12, 13... next: 14² = 196.
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Q25: Find the missing number in the series:
2, 4, 6, 8, ?
Answer: A
Simple arithmetic progression: +2 each time. So next is 10.
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Q26: Find the missing number in the series:
2, 6, 18, 54, ?
Answer: B
Each number is multiplied by 3: 2×3=6, 6×3=18, etc. → 54×3 = 162.
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Q27: Find the missing number in the series:
1, 8, 27, 64, ?
Answer: C
Cubes of 1, 2, 3, 4 → next is 5³ = 125.
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Q150: Find the missing number in the series:
3, 6, 11, 18, 27, ?
Answer: B
Differences: +3, +5, +7, +9... next is +11 → 27+11 = 38.
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Q114: Find the missing number in the series:
0, 1, 1, 2, 3, 5, ?
Answer: B
Fibonacci series: next number is sum of previous two: 3+5=8.
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