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  • 提問GMAT余數(shù)題,實(shí)在數(shù)學(xué)差,希望指點(diǎn)!

    提問GMAT余數(shù)題,實(shí)在數(shù)學(xué)差,希望指點(diǎn)!
    If n is a positive integer and r is the remainder when (n-1)*(n+1) is divided by 24, what is the value of r?
    1. 2 is not a factor of n.
    2. 3 is not a factor of n.
    請(qǐng)問這題思路是什么啊?怎么利用那兩個(gè)條件,我完全無從下手
    (n+1)(n-1),中間是相乘,我多余打了個(gè)*
    英語人氣:134 ℃時(shí)間:2020-06-27 13:19:25
    優(yōu)質(zhì)解答
    Answer:According to the given condition,we have (n-1)(n+1)-r = 24m,where m is an integer,and therefore,r = n²-1-24m.1.Let m=0,n=3,we have r=8.Note that 2 is not a factor of n when n=3.2.Let m=0,n...
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