Question

Using suitable identities find the value of $999\times 1,001$.

• A. $10,99,999$
• B. $9,99,999$
• C. $10,00,001$
• D. None of the above

Answer 1

The correct option is B $9,99,999$

$999\times 1,001$
$=(1,000-1)\times (1,000+1)$
$=(1,000{)}^2-(1{)}^2$
[since, $(a^2-b^2)=(a-b)(a+b)$]
$=10,00,000-1$
$=9,99,999$