Civil Service Review 2026

Number Series Made Easy

1. Arithmetic Series (Add the same number)
Start: 2
+2 each time → 2 → 4 → 6 → 8 → 10
Think: Keep adding the same number.
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2. Geometric Series (Multiply by the same number)
Start: 3
×2 each time → 3 → 6 → 12 → 24 → 48
Think: Keep multiplying by the same number.
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3. Fibonacci Series (Add the last two numbers)
Start: 0, 1
Next = previous two added → 0 → 1 → 1 → 2 → 3 → 5 → 8
Think: Add the last two numbers to get the next.
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4. Square Numbers
1 → 4 → 9 → 16 → 25
Think: 1×1, 2×2, 3×3, 4×4...
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5. Triangular Numbers
1 → 3 → 6 → 10 → 15
Think: Add 1, then 2, then 3, then 4...
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