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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