Question

There are 10 Letters and 10 correspondingly 10 different Address. If the letter are put into envelope randomly, then find the Probability that Exactly 9 letters will at the Correct Address ?
A) 1/10
B) 1/9
C) 1
D) 0

Answer 1

Q:

There are 10 Letters and 10 correspondingly 10 different Address. If the letter are put into envelope randomly, then find the Probability that Exactly 9 letters will at the Correct Address ?

A) 1/10
B) 1/9
C) 1
D) 0

Answer:   D) 0 

Read Description:

We know that we have 10 letter and 10 different address and one more information given that exactly 9 letter will at the correct address.
Therefore the remaining one letter automatically reach to their correct address 

P(E) = favorable outcomes /total outcomes

Here favorable outcomes are '0'.

Hence, probability is '0'.