Hi,

Can someone explain what is '17th part' in below question. I am not able to understand that statement.

**Speed up Geometry**

In this CAT QA Geometry Explainer we deal with some special triangles that you should be familiar with so that you can quickly solve the questions in Geometry. These triangles are very frequent in CAT Geometry and Trigonometry based questions and knowledge of these triangles (sides, angles, etc) can be a huge time saver in the Geometry section.

**CAT QA Explainers – Special Triangles**

Question -* N is a four digit number whose unit digit is half of its thousand digit and the two middle digits are equal. Find the average of all such numbers. *

In the provided solution , the average across digit distribution is taken and represented in the 4 digit number form. Does this hold true that average of digits when put into a general number format give the average of the range of numbers?

@Shankarji Sir, can you please explain this?

**CAT QA Explainer | Geometry | Mensuration | Triangles **

Geometry is a vast area when it comes to the QA section of the CAT examination. Triangles are a favorite of the CAT QA section. In this explainer, we use solve past CAT and XAT Questions using basic properties of a triangle like Triangle inequality, Pythagoras Theorem, Hero’s Formula, etc.

**CAT QA Explainer – Triangle Basics**

**CAT QA Explainer | Numbers | Modern Math | How to get 99.5%tile, 95%tile, 90%tile | What to Skip?**

Numbers and Modern Math the scariest part of the CAT QA Section. It is a favorite of the discussion forums and Mocks but hardly comes up in the actual exams. In this session, we discuss what are the key areas to study. We cover

*Factors and Multiples, LCM, HCF*

*Remainders*

*Factorials*

*Permutations and Combinations*

*Probability*

*and more*

**CAT QA Explainer – Numbers and Modern Math**

solution

**CAT QA Explainer | Algebra | How to get 99.5%tile, 95%tile, 90%tile | What to Skip?**

Algebra shows up in quite a few questions in the CAT QA section. The common areas are Functions, Progressions and Indices, Surds and Logarithms. In this explainer video we look at the common areas and the study plan to master these areas.

**CAT QA Explanier – Algebra+**

@steevieg Did it "slip" your mind by any chance? xD

@randomguy587 Yeah, it randomly did. 😄