Discrete Math Ch 1 & 2

1. How many subsets can be formed from a set with n elements?

2^n

N^2

N-1

N!

The correct answer is 2^n because for each element in the set, there are two choices - either include it in a subset or exclude it. This results in 2^n total possible subsets.

Explanation

The correct answer is 2^n because for each element in the set, there are two choices - either include it in a subset or exclude it. This results in 2^n total possible subsets.

2. How many ways can k objects from a set of n objects be arranged?

P(n,k) = k!/(n-k)!

P(n,k) = n!/k!

P(k,n) = n!/(n-k)!

P(n,k) = n!/(n-k)!

ex: how many ways can four books from a set of 10 books be arranged on a shelf?

P(10,4)= 10*9*8*7=5040

The formula for permutations of k objects from a set of n objects is n!/(n-k)!. This formula takes into account the number of objects being selected (k) as well as the total number of objects in the set (n).

Explanation

The formula for permutations of k objects from a set of n objects is n!/(n-k)!. This formula takes into account the number of objects being selected (k) as well as the total number of objects in the set (n).

3. What is a combination?

The total sum of elements in a set.

An arrangement of elements in a specific order.

A subset, a selection of the elements of the set in which the order of the selected elements doesn't matter

A random assortment of elements with no relation.

A combination refers to a selection of elements where their order is irrelevant, unlike permutations which consider order.

Explanation

A combination refers to a selection of elements where their order is irrelevant, unlike permutations which consider order.

4. What is the formula for calculating combinations of n objects taken k at a time?

N^k

N!/[k!(n-k)!]

K!/n!

N^2/k

The correct formula for calculating combinations is n!/[k!(n-k)!], where n! represents the factorial of n, k! represents the factorial of k, and (n-k)! represents the factorial of (n-k). This formula accounts for both the order and repetition of objects in the calculation.

Explanation

The correct formula for calculating combinations is n!/[k!(n-k)!], where n! represents the factorial of n, k! represents the factorial of k, and (n-k)! represents the factorial of (n-k). This formula accounts for both the order and repetition of objects in the calculation.

5. What is a binomial coefficient?

Entry in row n, column k. C(n,k)

The number of outcomes in a binomial distribution.

An arithmetic operator used in binomial expressions.

The result of multiplying two binomials together.

A binomial coefficient represents the number of ways to choose k elements from a set of n elements, denoted as C(n,k). It is a mathematical formula used in combinatorics.

Explanation

A binomial coefficient represents the number of ways to choose k elements from a set of n elements, denoted as C(n,k). It is a mathematical formula used in combinatorics.

6. What is Pascal's Identity?

Pascal's Identity refers to the principle of probability formulated by mathematician Blaise Pascal.

Pascal's Identity is the equation discovered by Blaise Pascal to calculate the area of a triangle.

Pascal's Identity is a concept in psychology theorized by French philosopher Blaise Pascal.

Pascal's Identity in mathematics specifically deals with binomial coefficients and their relationships.

Explanation

Pascal's Identity in mathematics specifically deals with binomial coefficients and their relationships.

7. What is the Binomial Theorem?

A geometric formula for calculating the area of a circle.

An algebraic equation that includes two variables.

A theorem explaining the properties of prime numbers.

The Binomial Theorem specifically deals with the expansion of powers of binomials, providing a method for expressing such expressions without having to multiply out the terms individually.

Explanation

The Binomial Theorem specifically deals with the expansion of powers of binomials, providing a method for expressing such expressions without having to multiply out the terms individually.

8. What mathematical series involves the expansion of a binomial expression?

Geometric Series

Fibonacci Sequence

Taylor Series

The Binomial Series specifically deals with the expansion of a binomial expression, wherein two terms are involved.

Explanation

The Binomial Series specifically deals with the expansion of a binomial expression, wherein two terms are involved.