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Three letters are written to different p...

Three letters are written to different persons, along with their addresses on three envelopes. Without looking at the letters, the probabiliy that letters go into right envelopes is

A

a) 1/n!

B

b) 1 - 1/n!

C

c) 1 - 1/n

D

d) 1/2! - 1/3! + …. + (-1)^n/n!

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