C. 26 / 26
ExplanationStep 1: This is a conjugate product. Step 2: (5+i)(5-i)=5²-i²=25-(-1)=26. Step 3: Always remember i² = -1.
Step 1: यह conjugate product है। Step 2: (5+i)(5-i)=5²-i²=25-(-1)=26। Step 3: i² = -1 हमेशा याद रखें।
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