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21 December, 16:13

When isaac opens a book, the product of the page nuumbers on the open pages is 420?

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  1. 21 December, 16:23
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    X (x+1) = 420

    x²+x-420=0

    (x+21) (x-20) = 420

    x = - 21 or + 20. since we don't use negative page numbers discard - 21 and let x be 20. the 2 pages are thus 20 and 21
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