the probability that a student obtain $3n$ marks in 4 papers

Question

An examination consists of 4 papers. 1st 3 papers has $n$ marks and 4th paper has $2n$ marks what is the probability that a student obtain $3n$ marks in 4 papers.

score 0 · Answer 1 · edited Jun 12 '20 at 10:38

0

This is equivalent to solving: $$a+b+c+d=3n$$ where$$a,b,c=[0,n]$$ $$d=[0,2n]$$ and then use this :Link

edited Jun 12 '20 at 10:38

Community

1

answered Oct 20 '13 at 10:11

rnjai

1,774

the probability that a student obtain $3n$ marks in 4 papers

1 Answers1