Mathematics · Probability · NCERT Examples

Example 2

A complete, independently verified solution for NCERT Example 2.

Change resourceExample 2

Mathematics · Chapter 14 · NCERT Examples

Download PDF
Verified NCERT questions and solutionsSolutions are checked independently and follow the supplied NCERT chapter edition.

NCERT Example

Example 2

coloured balls · elementary events

A bag contains one red ball, one blue ball and one yellow ball, all of the same size. Kritika draws one ball without looking. Find the probability of drawing (i) the yellow ball, (ii) the red ball and (iii) the blue ball.

Solution

Board-exam working:

The three balls are equally likely to be selected.

S={Y,R,B},n(S)=3S=\{Y,R,B\},\qquad n(S)=3

Each required event has exactly one favourable outcome.

P(Y)=13P(Y)=\frac13
P(R)=13P(R)=\frac13
P(B)=13P(B)=\frac13

Final answer

P(Y)=P(R)=P(B)=13\boxed{P(Y)=P(R)=P(B)=\frac13}

Study assistant

Padhona AI

Ask about anything you’re studying.

Contextual study help

Ask about what you’re studying

Sign in to use contextual Padhona AI on study pages.

  • Padhona AI understands the question you’re viewing
  • Ask about a step without copying the whole question
  • Free accounts get 10 contextual messages per day
Sign inOpen Padhona AI