# (197 × 203) = ?A. 39991 B. 39999C. 40009 D. 40001

We can write following problem such as,

(197 × 203) = (200 – 3)(200 + 3)

From the formula, (a +b)(a – b) = a2 – b2

We get,

(200 – 3)(200 + 3) = 2002 – 32 = 40000 – 9 = 39991.

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