B. 21 / 21
ExplanationStep 1: nCr is the formula for selection. Step 2: 7C2 = 7×6/(2×1) = 21. Step 3: In selection order is not important.
Step 1: nCr selection का formula है। Step 2: 7C2 = 7×6/(2×1) = 21। Step 3: Selection में order important नहीं होता।
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