PERMUTATIONS AND COMBINATIONS   IMPORTANT FACTS AND FORMULAE   Factorial Notation: Let n be a positive integer.  Then, factorial n,

CLOCKS IMPORTANT FACTS   The Face or dial of a watch is a circle whose circumference is divided into 60

RACES AND GAMES IMPORTANT FACTS   Races: A contest of speed in running, riding, driving, sailing or rowing is called

AREA FUNDEMENTAL CONCEPTS I.RESULTS ON TRIANGLES: 1.Sum of  the angles of a triangle is 180 degrees.   2.Sum of any

LOGARITHMS  IMPORTANT FACTS AND FORMULAE   Logarithm: If a is a positive real number, other than 1 and am =

BANKER’S DISCOUNT   IMPORTANT CONCEPTS Banker’s Discount : Suppose a merchant A buys goods worth, say Rs. 10,000 from another

­SIMPLE INTEREST    IMPORTANT FACTS AND FORMULAE 1.. Principal: The money borrowed or lent out for a certain period is

COMPOUND INTEREST   Compound Interest: Sometimes it so happens that the borrower and the lender agree to fix up a

BOATS AND STREAMS   IMPORTANT FACTS AND FORMULAE   1.In water ,the direction along the stream is called downstream and

PIPES AND CISTERNS IMPORTANT FACTS AND FORMULAE   Inlet: A pipe connected with a tank or a cistern or a