# Category: Number System

## Important formulas from Number System for CAT/XAT/IIFT/NMAT/SNAP/MICAT/CMAT

1.Natural number : Counting numbers 1,2,3,4 etc are called natural numbers. 2.Whole Numbers : Natural Numbers and 0 3.Integers : All natural numbers, 0, and negative numbers together form the set of integers. {…….-3, -2,...

## How to find number of positive integers ‘x’ such that x/4 has 3 digit & x/3 has 4 digits ?

You might have solved last year CAT papers(when it was available) or any AIMCAT/SIMCAT/..CAT. \/ A very unique question, isn’t it ? \/ So what thought process comes in your mind right now ?...

## How to find last two digit of a large number in the form of power

You might have solved last year CAT papers(when it was available) or any AIMCAT/SIMCAT/..CAT. \/ A very unique question that troubles you is the last 2 digit of a number in form of a...

## How to find last two digit of a large number in the form of a product

You might have solved last year CAT papers(when it was available) or any AIMCAT/SIMCAT/..CAT. \/ A very unique question that troubles you is the last 2 digit of a number in form of a...

## How to find if a factorial of a number is divisible by a certain number

You might have solved last year CAT papers(when it was available) or any AIMCAT/SIMCAT/..CAT. \/ A peculiar type of question that troubles you is whether the factorial of a number is divisible by certain...

## MBA : Quantitative Aptitude

There is a group of 11 people namely: A1, A2, A3, …, A11. The number of balls with A1 through A11 in that order is in arithmetic progression. If the number of balls with...

## How to find number of digits in a Natural Number

You might have solved last year CAT papers(when it was available) or any AIMCAT/SIMCAT/..CAT. \/ 1 question that troubles you is to find the number of digits in a number. \/ Well there are...

## Practice Test:Number System

If a three digit number ‘abc’ has 2 factors (where a, b, c are digits), how many factors does the 6-digit number ‘abcabc’ have? a.16   b.24   c.18   d.30 2. P and q...

## Number System : Divisibility by 7

90 Days to CAT – A free short Course – Schedule  \/ Take the last digit off the number. Double it and subtract the doubled number from the remaining number. If the result is...

## Number System : Divisibility by 6

90 Days to CAT – A free short Course – Schedule  \/ Method 1: Check the original number if it is both an even number (divisible by 2) and (divisible by 3). This is the...

## Number System : Divisibility by 5

90 Days to CAT – A free short Course – Schedule  \/ Check the last digit in the given number and check  if it is either 0 or 5. If the last number is either...

## Number System : How to find remainder when multiplication of Numbers is divided by a Number

90 Days to CAT – A free short Course – Schedule  \/ Lets try to find remainder when 16 x 21 is divided by 13. \/ Steps : Write the digits as the number...

## Number System : Divisibility by 4

90 Days to CAT – A free short Course – Schedule  \/ The basic rule for divisibility by 4 is that if the number formed by the last two digits in a number is...

## Number System : Divisibility by 3

90 Days to CAT – A free short Course – Schedule  \/ Method 1 : Take any number Add together each digit in the number. Check if the sum  is divisible by 3. If...

## Number System : Divisibility by 2

90 Days to CAT – A free short Course – Schedule  \/ Take any number and note the last digit in the number, discarding the other digits. Then take that digit while ignoring the...

## Number System : Co-Primes or Relatively Prime

90 Days to CAT – A free short Course – Schedule  \/ So what do we mean by Co-Primes or Relatively Prime Nos. ? A set of numbers which do not have any other...

## Number System : How to find sum and number of even and odd factors of a Number

90 Days to CAT 2015 – Schedule  \/ How to find sum and number of even and odd factors of a Number \/ Earlier in the article “How to find sum and number of...

## Number System : How to find sum and number of factors of a Number

90 Days to CAT – Schedule  \/ How to find sum and number of factors of a Number \/ You might have encountered with such questions in earlier CAT papers or any Test series....

## [CSAT][CAT] Basic Numeracy – Percentages – Concept (Tips & Tricks) – 2

Regaining back from our last post : [CSAT][CAT] Basic Numeracy – Percentages (Tips & Tricks) – 1, now lets learn the basic concept behind the percentage and what actually percent is. Percent : A percent...

## [CSAT][CAT] How to find maximum positive and negative roots of a polynomial

To find the maximum number of  positive and negative real roots of a polynomial f(x), we should consider Descartes’ rule of signs. This rules does not tell the exact number of positive or negative roots....