In this post we explain the basics of Highest Common Factor (HCF) also known as the Greatest Common Divisor(GCD) or the Greatest Common Factor(GCF). We will understand the techniques on how to find the HCF of two or more numbers. Under the “Problems on HCF” section we will solve some important aptitude problems on HCF. […]
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Given a number $x$, can you determine if it is divisible by a number say $y$ with out even performing the actual division. Divisibility rules are quite handy when you want to test for divisibility of numbers even before you can actual divide the number. For instance, to check if a number is divisible by 7, […]