wiz-icon
MyQuestionIcon
MyQuestionIcon
21
You visited us 21 times! Enjoying our articles? Unlock Full Access!
Question

Let E and F be two independent events. The probability that exactly one of them occurs is 1125 and the probability of none of them occurring is 225. If P(T) denotes the probability of occurrence of the event T, then

A
P(E)=45, P(F)=35
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
P(E)=15, P(F)=25
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
P(E)=25, P(F)=15
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
P(E)=35, P(F)=45
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct options are
A P(E)=45, P(F)=35
D P(E)=35, P(F)=45

P(EF)P(EF)=1125 . . . (i)
[i.e. only E or only F]

Probability that neither of them occurs =225
P(¯E¯F)=225 (ii)
From Eq. (i), P(E)+P(F)2P(EF)=1125 . . . (iii)
From Eq. (ii), (1P(E))(1P(F))=225
1P(E)P(F)+P(E).P(F)=225 . . .(iv)
From Eqs. (iii) and (iv),
P(E)+P(F)=75 and P(E).P(F)=1225 P(E).[75P(E)]=1225(P(E))275P(E)+1225=0[P(E)35][P(E)45]=0 P(E)=35 or 45P(F)=45 or 35

flag
Suggest Corrections
thumbs-up
9
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Defining Probability
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon