(IGP) IAS Pre Paper - 2: GS - Basic Numeracy - Indices & Surds

In 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’.

eg,

1. 3⁶ = 3 × 3 × 3 × 3 × 3 × 3 = 729
4³ = 4 × 4 × 4 = 64

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