C. 7 / 7
ExplanationStep 1: Factorial relation is 7! = 7×6!. Step 2: 7!/6! = 7. Step 3: Factorial cancellation makes calculation faster.
Step 1: Factorial relation 7! = 7×6! होता है। Step 2: 7!/6! = 7 है। Step 3: Factorial cancellation से calculation तेज होती है।
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