Can you solve it now?
Solve for n where....
b) P (n,5) = 42 x P(,3) -- out of 5 marks
I know that you have to split up the equation into two sides (left side = right side)
This is as far as I've come with the question..
LS = n! divided by (n-5) RS = 42 x n! divided by 2!
please help me with the rest of the steps!
Thanks in advance
From the book I am learning from, it shows separating into two equations: left side of the equal sign and right side of the equal sign. Are you combining them together?
I know how to break down (n-3)! into n(n-1)(n-2).. but I'm not sure how to break down (n-5)!
We're just working with a normal, algebraic equation:
No ... .I know how to break down (n-3)! into n(n-1)(n-2).. but I'm not sure how to break down (n-5)!
Remember, you're multiplying all the numbers from (n-3) all the way down to 1.
For example, if , we would have:
For your question, expand in the denominator as you would with in the numerator and see what cancels