# Math Help - Find the pdf from the cdf

1. ## Find the pdf from the cdf

At the points x = 0, 1,..., 6, the cdf for the discrete random variable X has the value Fx(x) = x(x +1)/42. Find the pdf for X.

2. Originally Posted by donald17
At the points x = 0, 1,..., 6, the cdf for the discrete random variable X has the value Fx(x) = x(x +1)/42. Find the pdf for X.
The pdf is $f(x)=F_X(x)-F_X(x-1);~x=1,2,\cdots,6$.