B. 20 / 20
ExplanationStep 1: nCr is used for selection. Step 2: 6C3 = 6×5×4/(3×2×1) = 20. Step 3: Order is not important in selection.
Step 1: nCr selection के लिए use होता है। Step 2: 6C3 = 6×5×4/(3×2×1) = 20। Step 3: Selection में order important नहीं होता।
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