📐 Mathematics · Chapter-Wise Mock Test
~2 questions per paper · 6% Mathematics weightage
nPr = n!/(n-r)!nCr = n!/r!(n-r)!Circular: (n-1)!With repetition: nⁿStars & bars: ⁽ⁿ⁺ʳ⁻¹⁾Cᵣ₋₁Permutation & Combination problems require careful case analysis, often with multiple conditions. Circular arrangements, distribution of identical/distinct objects, arrangements with restrictions (men/women alternating, no two together) require systematic case breakdown.
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