求助下面关于β分布和数列的问题（1）β分布的众数是什么呀?（2）关于下列序列,计算所有能使该序列收敛的初始值X0的范围以

x(i+1) = (xi)^3-3(xi)^2 +3xi
x(i+1) -1 = (xi-1)^3
ln[x(i+1) -1]/ln(xi-1) = 3
ln(xi-1)/ln(x0-1)=3^i
xi = 1+ (x0-1)e^(3i)
lim(i->∞) xi
= 1 + lim(i->∞)(x0-1)e^(3i)
consider
lim(i->∞)(x0-1)e^(3i)
=lim(i->∞)(x0-1)/e^(-3i)
exists when x0=1
xi = 1 ; i=0,1,2,.
lim(i->∞)xi = 1