From probability to proving
Lots of questions that I've tried and gotten stuck on. I'll post the questions and my answers to them
1) Fully simplify
I got I think that's right.
2) Nicolas has 30 beads in a bag. 9 of them are white. 8 green. 13 blue. What is the probability that if two beads are taken from the bag at random that they will not be the same colour. I got Definitely wrong
3)OPR is a triangle. OP = p and OR = r
a.Find the vector PR in terms of p and r
(No answer, I tried it but I just got stuck)
A os a point on PR such that PA:AR=7:2
b. Show that OA =
Again I tried but couldn't even get close to an answer...
4)Prove that, for all positive integer values of n, is a multiple of 2.
Here I found out why but I just don't know how to word it so an exam will accept it...