C. 12 / 12
ExplanationStep 1: In permutation order is important. Step 2: 4P2 = 4×3 = 12. Step 3: Use nPr in arrangement problems.
Step 1: Permutation में order important होता है। Step 2: 4P2 = 4×3 = 12। Step 3: Arrangement में nPr का use करें।
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