A. हाँ / Yes
ExplanationStep 1: Identify one-one function. Step 2: Different x values give different 2x values, so it is one-one. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: one-one function पहचानें। Step 2: अलग x values अलग 2x values देती हैं इसलिए one-one है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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