A number is divisible by 8 if the number formed by the last three digits is divisible by 8. A number is divisible by 9 if the sum of the digits is divisible by 9. A number is divisible by 10 if the units digit is 0. A number is divisible by 11 if the difference of the sum of its digits at odd places and the sum of its digits at even places, is divisible by F and L.
F stands for Highest Common Factor. The other names for H. F are Greatest Common Divisor G. D and Greatest Common Measure G. The H. The least number which is exactly divisible by each one of the given numbers is called their L. Two numbers are said to be co-prime if their H. M of denominators L. The equality of two different ratios is called proportion. This is represented by a : b :: c : d. Suppose a man covers a certain distance at x kmph and an equal distance at y kmph.
Time taken by a train x metres long in passing a signal post or a pole or a standing man is equal to the time taken by the train to cover x metres. Suppose two trains are moving in opposite directions at u kmph and v kmph. Properties : 1. Radius 2 2? R2-r2 where R and r are the outer and inner radii of the ring. Then, 1. Then 1. Thanks these are beneficial for us to time consuming formulae. It is helping to make my aptitude solving techniques better and faster.
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