Solve 206Ã194 using identity
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(200+6) (200-6)
(a+b)(a-b) = a^2 - b^2
(200)^2 - ( 6)^2
40000 - 36
39964
(a+b)(a-b) = a^2 - b^2
(200)^2 - ( 6)^2
40000 - 36
39964
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