Email
Chat with tutors
logo

Ask Questions, Get Answers

X
 
Answer
Comment
Share
Q)

$\sum^{n} _ {r=0} r. \: ^nCr$ = ?

$\begin{array}{1 1} 2^n \\ 2^{n-1} \\ n.2^{n-1} \\ n.2^n \end{array} $

1 Answer

Home Ask Tuition Questions
Practice
Your payment for is successful.
Continue
...