show that,given any sequence of n integers,x1,x2,x3.xn some consecutive collection has a sum dividib

题目

show that,given any sequence of n integers,x1,x2,x3.xn some consecutive collection has a sum dividible by n

答案

coeffient后面是X^2;of后面是(1 3x)^n 给膨胀系数赋值189时,显示结果是n等于7.请参考选用.