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The letters of the word PRABABILITY are ...

The letters of the word PRABABILITY are written down at random in a row. Let `E_1` denotes the event that two Is are together and `E_2` denotes the event that `B ' s` are together, then `P(E_1)=P(E_2=3/(11)` (b) `P(E_1nnE_2)=2/(55)` `P(E_1uuE_2)=(18)/(55)` (d) `P((E_1)/(E_2))=1/5`

A

`p (E_1)=p(E_2)=(3)/(11)`

B

`p(E_1 cap E_2)=(2)/(55)`.

C

`p(E_1 cup E_2) =(18)/(55)`.

D

`p((E_1)/(E_2))=(1)/(5)`.

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