Basic numeracy-indices-and-surds

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Published on March 18, 2014

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Basic numeracy-indices-and-surds

Click Here to Join Online Coaching Click Here www.upscportal.com Basic Numeracy

www.upscportal.com Click Here to Join Online Coaching Click Here A fraction is a part of the whole (object, thing, region). It forms the part of basic aptitude of a person to have and idea of the parts of a population, group or territory. Civil servants must have a feel of ‘fractional’ thinking. eg,5/12 , here ‘12’ is the nIn our day-to-day life, we get plenty of data in form of powers of numbers. To have a feeling of what they measure we need to have an exact idea of indices and surds. There may be some kit items in CSAT, specifically designed to test proficiency of candidates in indices and surds. Indices In the expression xn, n is called the exponent or index and x is called the base and xn is read as ‘x to the power of n’ or ‘x raised to the power n’. Indices & Surds

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www.upscportal.com Click Here to Join Online Coaching Click Here Laws of Indices 10. When the bases of two numbers are equal, then their powers are also equal. eg, If 3n = 32, then, n = 2. 11. When the powers of two numbers are equal, then their bases are equal. eg, If a3 = 43, then a = 4. Where a is a positive real number and n is a rational number.

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www.upscportal.com Click Here to Join Online Coaching Click Here Laws of Radicals Rationalisation of a Surd If the product of two surds is rational, then each of the two surds is called a rationalising factor of the other. In general if the surd is of type , then its rationalising factor is a . The rationalising factor of a surd is not unique. But it is always convenient to use the simplest of all rationalising.

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www.upscportal.com Click Here to Join Online Coaching Click Here Comparison of Surds Comparison of surds is possible only when they are of the same order. The radicals can be compared.

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