Friday

April 18, 2014

April 18, 2014

Posted by **mysterychicken** on Friday, June 7, 2013 at 3:11pm.

I got an = 8n - 2

Is that right?

2. The following statement is true by mathematical induction: (4/3)^n > n for all n > or equal to 6

True?

3. To find the 6th binomial coefficient of the expansion of (x + y)^15, find the value of 15C6

Not sure...

4. In how many ways can a 10-question, true-false exam be answered (assume that no questions are skipped)?

This really tricks me. I want to say 20 but I think there are more ways

5. In how many ways can 6 people sit in a 6-passenger car?

Again, not sure...36?

- Math -
**Steve**, Friday, June 7, 2013 at 6:09pm#1 looks ok

#2. sounds like you're guessing

To prove it, check when n=6

(4/3)^6 = 5.6

Bzzzt.

(However, it is true for n>6)

#3. That is correct.

The kth coefficient in (x+y)^n = C(n,k)

#4. You are correct in think that 20 is way too low.

There are 2 choices for every answer. So, there are 2^10=1024 ways to answer the questions.

#5. There are n! ways to arrange n things. So, there are 6! = 720 ways to seat 6 people in a line.

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