B. 13 / 13
ExplanationStep 1: This is a conjugate product. Step 2: (2+3i)(2-3i)=2²-(3i)²=4-9i²=4+9=13. Step 3: Always remember i²=-1.
Step 1: यह conjugate product है। Step 2: (2+3i)(2-3i)=2²-(3i)²=4-9i²=4+9=13। Step 3: i²=-1 को हमेशा याद रखें।
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