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NCERT Class 10 Mathematics Solutions: Chapter 15- Probability Exercise 15.1 Part 7
1. A box contains discs which are numbered from . If one disc is drawn at random from the box, find the probability that it bears
(i) a two-digit number
(ii) a perfect square number
(iii) a number divisible by .
Answer:
Total numbers of discs
(i) Total numbers of favorable events
Probability that it bears a two-digit number
(ii) Perfect square numbers
Favorable numbers of events
Probability of getting a perfect square number
(iii) Numbers which are divisible by 5
Favorable numbers of events
Probability of getting a number divisible by
2. A child has a die whose six faces show the letters as given below:
The die is thrown once. What is the probability of getting (i) (ii)
Answer:
Total numbers of events
(i) Total numbers of faces having A on it
Probability of getting
(ii) Total numbers of faces having D on it
Probability of getting
3. Suppose you drop a die at random on the rectangular region shown in the given figure. what is the probability that it will land inside the circle with diameter ?
Answer:
Area of the rectangle
Area of the circle
=
Area of rectangle gives the total number of events and area of circle gives the number of favourable events.
So, probability that die will land inside the circle
(Put the value of )