Evaluate 101 x 99 using appropriate identities
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101×99
(100 + 1)(100-1)
a^2 - b^2 = (a+b)(a-b)
100^2 -1^2
10000-1
9999
(100 + 1)(100-1)
a^2 - b^2 = (a+b)(a-b)
100^2 -1^2
10000-1
9999
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