D. 3
ExplanationStep 1: Identify definite integral. Step 2: Constant is 1 and interval length is 3, so value is 3. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: definite integral पहचानें। Step 2: constant 1 और interval length 3 है इसलिए value 3 है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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