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OpenStudy (anonymous):
Given the expression: 1990 x 1991 - 1989 x 1990. What counting number is equivalent to the expression?
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OpenStudy (anonymous):
1990 x 1991 - 1989 x 1990 = 1990 ( 1991-1989) = 3980
OpenStudy (anonymous):
Thanks ... got it... y cant I think like you guys...!
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