What should be added to the product of 123 × 321 to get 39999?

What should be added to the product of 123 × 321 to get 39999? Correct Answer 516

Calculation:

[ alt="F3 Vikash kumar 11-5-2021 Swati D1" src="//storage.googleapis.com/tb-img/production/21/05/F3_Vikash%20kumar_11-5-2021_Swati_D1.png" style="width: 103px; height: 141px;">

Let the number added be x

Now, A/Q

39483 + x = 39999

⇒ x = 39999 - 39483

⇒ x = 516

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