Suppose is a 6-digit number, are three different 1-digit num

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Suppose is a 6-digit number, are three different 1-digit numbers, and not less than 4.
If M is a multiple of 7, then the minimum value of M is

这个题要你找最小的M.
给你条件是a>=4,b>=4,c>=4.
那么假设M=100000a+10000b+1000c+321,因为a,b和c分别为千,万和十万位数
从最小的开始试,M=444321
如果除不掉7那就试M=445321,以此类推.
再问：这个方法我也会啊，计算量有点大，有更好点的方法吗？
再答：应该不会阿，7是个prime number（质数），能被7除的不多。这个就是类似奥数的题而已。

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