Question

a pair of dice is thrown. if the two numbers appearing on them are different, find the probability that i) the sum of the numbers is 6 ii) the sum of the numbers is 4 or less


I am a bit confused about his answer how can (3,3) be considered as it is clearly mentioned in the question that both the numbers are different.

Please anyone explain me this if I am wrong.

Spam not allowed​

Answer 1

let Sample space be S

S = { (1,2) , (1,3) , ( 1,4) , (1, 5) , (1, 6) ,

(2, 1), (2, 3), (2, 4), (2, 5), (2, 6),

(3, 1), (3, 2), (3, 4), (3, 5), (3, 6),

(4, 1), (4, 2), (4, 3), (4, 5), (4, 6),

(5, 1), (5, 2), (5, 3), (5, 4), (5, 6),

(6, 1), (6, 2), (6, 3), (6, 4), (6, 5).}

n(S) = 30

let A is an event for getting the sum of the number is 6

A = { (1, 5), (2, 4), (4, 2), (5, 1) }

n(A) = 4

p(A) =n(A) /n(S)

p(A) = 4/30

p(A) =2/15

let B is an event for getting sum of the number is 4 or less

B={ (1, 2), (1, 3), (2, 1), (3, 1) }

n(B) = 4

p(B) =n(B) / n(S)

= 4 / 30

p(B) = 2/ 15

Answer 2

Answer:

An electrical insulator is a material in which electric current does not flow freely. ... Other materials—semiconductors and conductors—conduct electric current more easily. The property that distinguishes an insulator is its resistivity; insulators have higher resistivity than semiconductors or conductors.

Step-by-step explanation:

YES YOU ARE RIGHT BY MISTAKE I HAVEN'T PUT