A coin is tossed until a head appears or until ithas been tossed three times. Given that head doesnot occur on the first toss, then the probabilitythat the coin is tossed thrice is
A
14
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
34
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
12
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
13
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is C12 Total Possible cases {H, TH, TTH} P(H)=1/2 P(TH)=12×12=14 P(TTH)=12×12×12=18 P(coin is tossed thrice) =P(TTH)+P(TTT) =1/4 P(coin is tossed thrice | first toss not head) =1/41/2=12