Chapter 14 · Question 1

Define theoretical probability of an event.

Answer Revealed

Direct Answer:

If all outcomes are equally likely,

P(E)=\frac{\text{number of outcomes favourable to }E}{\text{number of all possible outcomes}}

Probability is favourable outcomes divided by total equally likely outcomes.

Theoretical probability is based on reasoning, not repeated experiments. For an event

E

, when outcomes are equally likely,

P(E)=\frac{n(E)}{n(S)}

, where

S

is the sample space and

n(E)

is the number of favourable outcomes.

If all outcomes are equally likely, $P(E)=\frac{\text{number of outcomes favourable to }E}{\text{number of all possible outcomes}}$ .
Use the NCERT formula or theorem carefully.
Write units and final conclusion where applicable.

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