**Permutation (nPr) is the way of arranging the elements of a group or a set in an order**. The formula to find permutations is: nPr = n!/(n-r)! Combination (nCr) is the selection of elements from a group or a set, where order of the elements does not matter.

### What's the difference between nCr and nPr?

**Permutation (nPr) is the way of arranging the elements of a group or a set in an order**. The formula to find permutations is: nPr = n!/(n-r)! Combination (nCr) is the selection of elements from a group or a set, where order of the elements does not matter.

### How do you average 2 averages?

A combined mean is a mean of two or more separate groups, and is found by : Calculating the mean of each group, Combining the results.**To calculate the combined mean:**

- Multiply column 2 and column 3 for each row,
- Add up the results from Step 1,
- Divide the sum from Step 2 by the sum of column 2.

### Where do banks get their money?

Banks primarily make money **from the interest on loans and the fees they charge their customers**. These fees can be tied to specific products, such as bank accounts or related to financial services. For example, an investment bank that offers portfolio management to investors can charge a fee for that service.

### Do marine biologists travel a lot?

One thing that is common across this field is that **marine biologists travel a lot**. Travel is required for attending conferences, to remote research locations if your work is based on field research and any trips that may be a part of a course curriculum if you are teaching field-based courses.

### Why is molecular shape important in medicine design?

Shape is a fundamentally important molecular feature that **often determines the fate of a compound in terms of molecular interactions with preferred and non-preferred biological targets**.

### What is the safest currency in the world?

### Who brought the first human civilization to the world history?

**Sumer, located in Mesopotamia**, is the first known complex civilization, having developed the first city-states in the 4th millennium BCE.

### What orbits around the nucleus?

**The electron** travels in circular orbits around the nucleus. The orbits have quantized sizes and energies. Energy is emitted from the atom when the electron jumps from one orbit to another closer to the nucleus.

### Why is a pearl not a mineral?

Pearl are made up of little overlapping platelets of the mineral aragonite, a calcium carbonate that crystallizes in the orthorhombic system. Although the pearl itself is made up of a mineral, **its organic origin** excludes it from being included with minerals.

### Are DC fans better than AC?

**DC fans are widely regarded as the most efficient type of fans**. They consume significantly less power than AC fans. In fact, DC fans consume up to 70 percent less energy to produce the same output as traditional AC fan types. This means, that a 25-watt DC-driven yields the same results as 100-watt AC fan.

### Which is the best automation software?

**Here's a list of the top 10 automation testing tools :**

- Selenium.
- Appium.
- Katalon Studio.
- Cucumber.
- HPE Unified Functional Testing (UFT)
- SoapUI.
- TestComplete.
- Worksoft.

### What does MCQ stand for in the Philippines?

ECQ was finally lifted on May 15 for Metro Manila, when it became the current quarantine order under the name of **Modified Enhanced Community Quarantine** (MECQ or MCQ).

### What does mathematics and logic study?

We learn formulas, and we test answers to get results. But mathematical logicians study **math as a language**. They study mathematical content, not just problems and solutions. Mathematical logic explores the language of math in two ways: syntactic and semantic.

### How do I type math symbols in Google forms?

**Click the equation button and type the equation.** **Then click “Insert Math”**. EquatIO does not have symbol buttons you press like CodeCOGS. Simply start typing the symbol you want, and it will populate.

### How do you remember p-block reactions?

A2A. With practice and some simple tricks you can learn the reaction of p blocks.

- Write General Chemical reaction (highlighted) followed by some example reactions, exceptions to the reaction etc.
- UNDERSTAND the mechanism.
- Don't read your notes you prepared as if it's a Coffee Table book.
- Solve problems.

### How do you clean the internal parts of a power supply unit?

**Use a 12-oz.** **can of compressed air with a nozzle to blow dust and dirt off the power supply**. Hold the nozzle about 2 inches from the surface you're cleaning and always blow from the inside of the PC outward. Blow the air through the natural holes and air channels of the power supply's fan, shooting dust out of the PC.

### What are the 4 main characteristics of plants?

The four main characteristics of plants are **photosynthesis, cuticle, cell Walls and reproduction**.

### What are high-paying jobs?

Highest Paying Occupations

OCCUPATION | 2021 MEDIAN PAY |
---|---|

Family medicine physicians | This wage is equal to or greater than $208,000 per year |

Airline pilots, copilots, and flight engineers | $202,180 per year |

Nurse anesthetists | $195,610 per year |

Chief executives | $179,520 per year |

### What are the 3 types of metabolism?

There are three basic metabolism types: **ectomorph, mesomorph, and endomorph** – definitely words you probably don't use in your normal, day-to-day conversations. But learning the types of body you were born with will help your fitness plan in the long run.

### Is log 0 possible?

2. **log 0 is undefined**. It's not a real number, because you can never get zero by raising anything to the power of anything else. You can never reach zero, you can only approach it using an infinitely large and negative power.