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标题: prep一道题，好像答案不对？ [打印本页]

作者: assurance 时间: 2006-3-31 07:23 标题: prep一道题，好像答案不对？

The integers m and p such that 2<m<p and m is not a factor of p. If r is the remainder when p is divided by m, is r>1?

1)the greated common factor of m and p is 2

2)the least common multiple of m and p is 30

The answer of this question is A, but I choose D, because 2) is sufficient:

Under the condition of 2) the possible solution is m=3,p=10 or m=5,p=6 so r=1

Who can explain the ets answer to me?

作者: assfgrtrtr 时间: 2006-3-31 13:34

if m=10, p=15,then r=5>1

作者: assurance 时间: 2006-4-1 14:00

thanks !!!!!

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