Compute the following
a) 682
-322=.
b) 201*199=.
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A)360
B)39999
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a . 682 - 322 = ( 700 - 18) - ( 300 + 22)
= 700 - 18 - 300 - 22
= 700 - 340
= 360
b . 201 × 199 = (200 + 1) × (200-1)
= 40000 - 1
= 39999
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