Find the value

Question:

207 × 193 = ?
(a) 39851
(b) 39951
(c) 39961
(d) 38951

Solution:

(b) 39951

$207 \times 193$

$=(200+7)(200-7)$

$=(200)^{2}-(7)^{2}$

$=40000-49$

$=39951$

 

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