7. If M and N are two events, then probability that exactly one of them occurs is not equal to

- Option : B
- Explanation :

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- Option : A
- Explanation : Since odds are 8 to 3 against A
and P(A) + P(B) + P(C) = 1

Hence odds against C are 43 to 34.

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- Option : A
- Explanation : Let E
_{1}be the event that a ball is drawn from

first bag, E_{2}the event that a ball is drawn

from second bag and E the event a black ball

is chosen, therefore

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