The letters of the word PRABABILITY are written down at random in a\r\nrow. Let E_1\ndenotes the...

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