程序代写代做 C This is a header¶

This is a header¶
some text
in bold or italic
and even some quick math $A_j \leq e^x$ or long equations \begin{equation} QX(x) = \sum{i=0}^{\infty} y_i \end{equation}
In [3]:
# this is some code in R
a <- 4 b <- 3.5 a + b c <- a + b print(c) 7.5 [1] 7.5 In [ ]: