Math
posted by mysterychicken on .
Can someone check my answers and help me
1. A vector in standard position has its initial points at (0,0)
True?
2. The general formula for finding the probability of two events A and B that are not mutually exclusive and overlap is given by: P(A or B) = P(A) + P(B) + P(A and B)
True?
3. The formula for the arrangement of r of n objects is given by: n!/(nr)!
False?
4. In buying a car, a customer has a choice of 3 bumper types, 4 stereo systems, 8 interior colors, 2 engines, 4 carpets, and 6 seat covers. How many different combinations of these 6 options are available?
Is it 4608?
5. The following statement is true by mathematical induction: n! > or equal to 2^n for all natural numbers n
False
Thank you!

1. ok
2. dependent or independent?
independent is P(A) + P(B)  P(A&B)
3. True  check your text
4. ok
5. ok
but it is true for n>3 
So if it is true for n>3, would the answer be true?

NO! All natural numbers means n>0