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tesha
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yes b) is written correctlyRUber said:I don't think factoring is the right answer.
Are you sure that (b) is written correctly? n choose k is equal to n choose (n-k) normally, so I don't see how the sum could be.
For (c), try writing it out and rearranging.
##\frac{n!}{k!(n-k)!} + \frac{n!}{(k-1)!(n-(k-1))!}##
And you want this to be equal to:
##\frac{n+1!}{k!((n+1)-k)!}##
**edit** You should try to make a common denominator to add the fractions. If you do this carefully and correctly, the right answer pops right out.
tesha said:yes b) is written correctly
From the text before and after b) in the attachment, it is very clear to me that b) ought to read "show that nCk=nCn-k."tesha said:yes b) is written correctly
A factorial equation is a mathematical expression that involves calculating the product of a given number and all the positive integers below it.
To prove a factorial equation, you need to use mathematical induction. This involves showing that the equation holds true for the base case (usually n = 1) and then assuming it holds true for n = k and proving that it also holds true for n = k+1.
Proving factorial equations is important because it helps establish the validity of mathematical concepts and theories. It also allows us to make predictions and solve problems in various fields such as statistics, probability, and computer science.
Yes, some common mistakes when proving factorial equations include assuming that the equation holds true for all values of n without actually proving it, and not properly showing the base case or the induction step.
Yes, factorial equations can also be proven using combinatorial arguments, which involve counting the number of ways a particular situation can occur. This method is often used in probability and statistics.