What does 12 choose 3 mean?

What does 12 choose 3 mean?

What is 12 CHOOSE 3 or 12C3? 12 CHOOSE 3 = 220 possible combinations. 220 is the total number of all possible combinations for choosing 3 elements at a time from 12 distinct elements without considering the order of elements in statistics & probability surveys or experiments.

What is nCr equal to?

The combinations formula is: nCr = n! / (n – r)! r! n = the number of items. r = how many items are taken at a time.

How is nPr calculated?

nPr can also be represented as P(n,r). The formula of P(n, r) is: n! / (n – r)!. For example P(6, 2) = 6! / (6-2)! => 720 / 24 = 30.

What’s a combination?

A combination is a mathematical technique that determines the number of possible arrangements in a collection of items where the order of the selection does not matter. In combinations, you can select the items in any order. Combinations can be confused with permutations.

How are combination applied in real?

In smaller cases it is possible to count the number of combinations. For example given three fruit, say an apple, orange and pear, there are three combinations of two that can be drawn from this set: an apple and a pear; an apple and an orange; or a pear and an orange.

What is the combination of water?

Water is a combination of hydrogen and oxygen.

Which is not a combination reaction?

Answer. The second reaction is not an example of combination reaction. (AgNO3+NaCl –>AgCl + NaNO3.) The combination reaction happens when multiple reactants are combined into a single product by the chemical reaction.

What is the combination reaction give an example?

In combination reactions, two or more substances combine to form a new compound. Only one product is obtained in such reactions. The reactants in such reactions can be elements as well as compounds. For Example, Calcium oxide reacts with water to produce calcium hydroxide.

Which combination is an element?

Answer Expert Verified A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.

What are the five elements of?

Everything in nature is made up of five basic elements: earth, water, fire, air, and space. Knowledge of the five elements allows the yogi to understand the laws of nature and to use yoga to attain greater health, power, knowledge, wisdom and happiness.

How many elements are there?

118 elements

Can elements be broken down?

Note that an element: consists of only one kind of atom, cannot be broken down into a simpler type of matter by either physical or chemical means, and. can exist as either atoms (e.g. argon) or molecules (e.g., nitrogen).

Can a atom be destroyed?

All matter consists of indivisible particles called atoms. Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements. Atoms cannot be created or destroyed. The atom is the smallest unit of matter that can take part in a chemical reaction.

What is the simplest form that Cannot be broken down?

Elements are the simplest form of matter; cannot be broken down further by either physical or chemical means.

Which Cannot be broken down into simple substance?

A substance that cannot be broken down into simpler substances is a pure substance in its lowest form: an element. If if is an ionic compound, the lowest form would be an element. If it is a molecular compound or covalent compound, the lowest form would be a molecule.

What are the two classes of matter?

Classifying Matter Matter can be classified into several categories. Two broad categories are mixtures and pure substances. A pure substance has a constant composition. All specimens of a pure substance have exactly the same makeup and properties.

Which type of matter can be separated by physical means?

Mixtures

Why can’t the elements of a compound be separated from one another by physical means?

A mixture can be physically separated into its components; a compound cannot be physically separated into its components. Why can’t the elements of a compound be separated from one another by physical means? Their atoms are too tightly bound to one another.