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Numbers and number systems

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In this post let us clearly know about the classification of the number system.before classifying numbers let us know about numbers and number systems.  what is a number? =>A number can be defined as a group of digits which have some value. what is a number system? =>The systematic way in which numbers are organized
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Calendar problems solving tips without any formula

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If you keenly observe the calendar, if today is Wednesday same date of the next year will be Thursday (if there is no Feb 29 in between) and Friday(if Feb 29 comes) but what if someone asks you to find the day of a given random date? I have found many people asking calendar problems formula. there is no need for any formula as you can do it all by yourself with calendar problem aptitude tricks.  So here is a simple procedure with which you can simply find the day of a given date. Before learning the complete procedure, let me introduce a few basic terms required to solve these type of problems. Calendars are prepared based on the earth's orbit around the sun and it is designed it in a way that every orbit is equivalent to 1 year. with some fraction of the day left out for a year and this fraction is adjusted with the help of leap days. Most of the people think that every 4th year is a leap year but this is not true if one considers every 4th yea...
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Basics: Divisibility test

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Many problems in Aptitude solving can be done in seconds if you can apply these rules for divisibility test. Divisible by:                Rule 2                                   last digit is even(0,2,4,6,8) 3 -                                 sum of all the digits is divisible by 3 4                                   last 2 digits should be divisible by 4 5                                   the last digit is either 0 or 5
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