EVALUATE using identity
102 x 98
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(100+2) × (100-2)
(a+b)(a-b) = a^2- b^2
= 100^2-2^2
=10000-4=9996
(a+b)(a-b) = a^2- b^2
= 100^2-2^2
=10000-4=9996
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