Page 86 - Peluang 2022 part Gabungan_Neat

Erin thinks of a number from 1 to 10 (say 8) and asks Peter
Eri n thin ks o f a number from 1 t o 10 (say 8 ) and asks Pe ter

to guess what it is. Find the probability that Peter makes a
to guess wh at it is . Fin d the pro babili ty that Pe ter makes a

try if
Eri
n
s first
on

hi

Pe
ter
that the
ls
firs
t
tel
correct guess on his first try if Erin first tells Peter that the
g
cor
rect
ue
ss
g
reater
n
than 7
.
number is greater than 7.
umber is
n(S) = 10
Answer
Let A is the event that Peter guesses
1 3 8 number greater than 7
n(A) = 3
5 2 7 10 n(A) 3

4 6 9 P(A) = n(S) = 10