Solve 9992 × 10008 = ? Option a. 91999964 / b. 99999936 / c. 9999964 / d. 9999936

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9992 × 10008 = ? 

Formula: a² – b² = (a+b)(a-b)

= (10000 – 8)(10000 + 8)
= 10000² – 8²
= 100000000 – 64
= 99999936