1.
An arrangement or ordering of a number of distinct objects is...
Correct Answer
A. Permutation
Explanation
Permutation refers to the arrangement or ordering of a number of distinct objects. It involves considering the specific order in which the objects are arranged. This is different from combination, which does not consider the order. Branching and order are not relevant to the concept of arranging objects in a specific order.
2.
Selections of some members of a set where order is disregarded is called...
Correct Answer
A. Combination
Explanation
Combination is the correct answer because it refers to the selection of members from a set where the order of the elements does not matter. In other words, it is the process of choosing a subset of elements from a larger set without considering the arrangement or order in which they are chosen. This is different from permutation, which does consider the order of the elements, and arrangement, which refers to the order in which objects are arranged. Nomination is unrelated to the concept of selecting members from a set.
3.
A permutation could be referred to as...
Correct Answer
B. Ordered combination
Explanation
A permutation can be referred to as an ordered combination because it represents a specific arrangement or ordering of a set of elements. In a permutation, the order of the elements matters, and each element must be used exactly once. This is different from a nominal variable, which represents categories or labels without any inherent order. A lag variable refers to a variable that is shifted in time, and an outlier is an observation that significantly deviates from the other observations in a dataset.
4.
Which is an important parameter of permutation?
Correct Answer
A. Number of items being chosen at a time
Explanation
The number of items being chosen at a time is an important parameter of permutation because it determines the size of the permutation. In permutation, the order and arrangement of items matter, and the number of items being chosen at a time affects the total number of possible arrangements. The larger the number of items chosen, the greater the number of possible permutations. Therefore, the number of items being chosen at a time is a crucial factor in determining the complexity and possibilities of permutations.
5.
Which is a type of permutation?
Correct Answer
A. Cyclic
Explanation
A cyclic permutation is a type of permutation where the elements are shifted cyclically, meaning each element is moved to the position of the next element in the permutation. This creates a circular arrangement of elements. In a cyclic permutation, the last element is moved to the first position, and the other elements are shifted accordingly. This is different from a round permutation, where the elements are arranged in a circular order but not necessarily shifted cyclically. Open and real are not types of permutations.
6.
The product of all positive integers less than or equal to n is...
Correct Answer
C. N factorial
Explanation
The product of all positive integers less than or equal to n is represented by the mathematical notation "N factorial". It is denoted by the symbol "!" after the number N. For example, 5 factorial (5!) is equal to the product of all positive integers less than or equal to 5, which is 5 x 4 x 3 x 2 x 1 = 120. Therefore, the correct answer for this question is N factorial.
7.
How many different combinations of 3 numbers are there?
Correct Answer
B. 6
Explanation
There are 6 different combinations of 3 numbers.
8.
How many different combinations of 4 items are there?
Correct Answer
C. 24
Explanation
There are 4 items and we need to find the number of different combinations possible. To calculate this, we can use the formula for combinations, which is nCr = n! / (r!(n-r)!). In this case, n = 4 and r = 4. Plugging in these values, we get 4! / (4!(4-4)!) = 4! / (4!0!) = 4! / 4! = 1. Therefore, there is only 1 combination possible. However, none of the given options match this result, so the correct answer is not available.
9.
How many combinations can be made with 5 numbers?
Correct Answer
C. 120
Explanation
The number of combinations that can be made with 5 numbers can be calculated using the formula for combinations, which is nCr = n! / (r!(n-r)!). In this case, we have 5 numbers and we want to select all of them, so r = 5. Plugging these values into the formula, we get 5C5 = 5! / (5!(5-5)!) = 5! / (5!0!) = 5! / 5! = 1. Therefore, there is only one combination that can be made with 5 numbers. Since none of the given options match this calculation, the correct answer is not available.
10.
How many different combinations of 8 numbers are there?
Correct Answer
A. 40320
Explanation
There are 8 numbers and each number can be chosen in 8 different ways. Therefore, the total number of different combinations of 8 numbers is obtained by multiplying 8 by itself 8 times, which is equal to 40320.