Question

$106\times 106-94\times 94=$?

• A. $2400$
• B. $2000$
• C. $1904$
• D. $1906$
• E. None of these

Answer 1

The correct option is A $2400$

$106\times 106-94\times 94={\left(106\right)}^2-{\left(94\right)}^2$
$=(106+94)(106-94)$ [Ref: $(a^2-b^2)=(a+b)(a-b)$]
$=(200\times 12)$
$=2400$.