C. 29 / 29
ExplanationStep 1: Use modulus formula |a+ib| = √(a²+b²). Step 2: √(20²+(-21)²)=√841=29. Step 3: Modulus works like distance formula.
Step 1: Modulus formula |a+ib| = √(a²+b²) लगाएं। Step 2: √(20²+(-21)²)=√841=29। Step 3: Modulus distance formula जैसा होता है।
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