A class consists of 80 students, 25 of them are girls and 55 are boys. If 10 of them are rich and the remaining are poor and also 20 of them are intelligent, then the probability of selecting an intelligent rich girls is `5//128` b. `25//128` c. `5//512` d. none of these

Explanation

Consider the following events :

`A=` selecting a intelligent complexioned student

`B=` selecting a rich student

`C=` selecting a girl

We have,

`P(A)=frac{20}{80}=frac{1}{4}`

`P(B)=frac{10}{80}=frac{1}{8}`

`P(C)=frac{25}{80}=frac{5}{16}`

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