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RACES AND GAMES OF SKILL
Races :- A contest of speed in running ,riding,driving,sailing or rowing is called a Race
Race Course :-The ground or path on which contests are made is called a race course.
STARTING POINT :-The point from which a race begins is called starting point.
Winning point or goal:-The point set to bound a race [...]

Introduction:
Experiment:
An operation which can produce some well-defined outcome is called an experiment.

Random Experiment:
An experiment in which all possible out comes are known and the exact output cannot be predicted in advance is called a random experiment.
EX:
1) Rolling an unbiased dice.
2) Tossing a fair coin.
3) Drawing a card from a pack of well-shuffled cards .
4)Picking [...]

ALLIGATION OR MIXTURES
Important Facts and Formula:
1.Allegation:It is the rule that enables us to find the ratio in which two of more ingredients at the given price must be mixed to produce a mixture of a desired price.
2.Mean Price:The cost price of a unit quantity of the mixture is called the mean price.
3.Rule of Allegation:If two [...]