# PSEB Solutions for Class 10 Maths Chapter 15 Probability Ex 15.2

PSEB Solutions for Class 10 Maths Chapter 15 Probability Ex 15.2

## PSEB 10th Class Maths Solutions Chapter 15 Probability Ex 15.2

Question 1.

Two customers Shyam and Ekta are visiting a particular shop in the same week (Tuesday to Saturday). Each is equally likely to visit the shop on any day as on another day. What is the probability that both will visit the shop on

(i) the same day?

(ii) consecutive days?

(iii) different days?

Solution:

When Shyam and Ekta visit a particular shop in the same week. Possible outcomes are:

S = {(T, T) (T, W) (T, Th) (T, F) (T, S) (W, T) (W, W) (W, Th) (W, F) (W, S) (Th, T) (Th, W) (Th, Th) (Th, F) (Th, S) (F, T) (F, W) (F, Th) (F, F) (F, S) (S, T) (S, W) (S, Th) (S, F) (S, S)}

Here T stands For Tuesday

W stands For Wednesday

Th stands For Thursday

F stands For Friday

S stands For Saturday

n(S) = 25

(i) Let A is event that Shyam and Ekta visit the shop on the same day

A = {(T, T) (W, W) (Th, Th) (F, F) (S, S)}

n(A) = 5

Probability that both will visit the shop on same day = 5/25

∴ P(A) = 1/5.

(ii) Let B is event that both will visit consecutive days particular shop

B = {(T, W) (W, T) (W, Th) (Th, W) (Th, F) (F, Th) (F, S) (F, S)}

n(B) = 8

∴ Probability that both will visit particular shop on consecutive days = 8/25.

Question 2.

A die, is numbered in such a way that its faces show the numbers 1, 2, 2, 3, 3, 6. It is thrown two times and the total score in two throws is noted. Complete the following table which gives a few values of the total score on the two throws:

What is the probability that the total score is

(i) even?

(ii) 6?

(iii) at least 6?

Solution:

The complete table is

∴ Number of green marbles = 16

∴ Number of blue marbles = 24 – x = 24 – 16 = 8.

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