Q89: 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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Q1: Find the missing number in the series:
2, 3, 5, 7, 11, ?
Answer: A
Prime numbers: Next is 13.
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Q123: 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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Q29: Find the missing number in the series:
2, 3, 5, 7, 11, ?
Answer: A
Prime numbers: Next is 13.
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Q28: Find the missing number in the series:
1, 8, 27, 64, ?
Answer: D
Cubes of 1, 2, 3, 4 → next is 5³ = 125.
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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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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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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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Q90: Find the missing number in the series:
1, 4, 9, 16, 25, ?
Answer: B
These are squares of natural numbers: 1², 2², 3²... next is 6² = 36.
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Q105: Find the missing number in the series:
3, 6, 11, 18, 27, ?
Answer: A
Differences: +3, +5, +7, +9... next is +11 → 27+11 = 38.
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