Q91: Find the missing number in the series:
1, 4, 9, 16, 25, ?
Answer: C
These are squares of natural numbers: 1², 2², 3²... next is 6² = 36.
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Q92: Find the missing number in the series:
2, 6, 18, 54, ?
Answer: D
Each number is multiplied by 3: 2×3=6, 6×3=18, etc. → 54×3 = 162.
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Q93: Find the missing number in the series:
2, 3, 5, 7, 11, ?
Answer: A
Prime numbers: Next is 13.
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Q141: Find the missing number in the series:
2, 6, 18, 54, ?
Answer: A
Each number is multiplied by 3: 2×3=6, 6×3=18, etc. → 54×3 = 162.
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Q138: 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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Q140: Find the missing number in the series:
121, 144, 169, ?
Answer: D
These are squares of 11, 12, 13... next: 14² = 196.
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Q97: Find the missing number in the series:
1, 4, 9, 16, 25, ?
Answer: A
These are squares of natural numbers: 1², 2², 3²... next is 6² = 36.
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Q98: Find the missing number in the series:
1, 8, 27, 64, ?
Answer: B
Cubes of 1, 2, 3, 4 → next is 5³ = 125.
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Q99: Find the missing number in the series:
2, 3, 5, 7, 11, ?
Answer: C
Prime numbers: Next is 13.
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Q100: Find the missing number in the series:
10, 7, 4, 1, ?
Answer: D
Each term decreases by 3. Next: 1 - 3 = -2.
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