D. 3
ExplanationStep 1: Identify determinant formula. Step 2: ad-bc=2×2-1×1=3. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: determinant formula पहचानें। Step 2: ad-bc=2×2-1×1=3 है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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