40 views
A coin is tossed 10 times Find the probablity of obtaining head at least once

Sample space size $= 1024$
No. of favourable cases $= 1024-1=1023$
Probability $= \frac{1023}{1024} =99.90 \%$
answered by (814 points) 1 13
selected
+1 vote
Probability of obtaining head at least once    =  1 - ( Probability of obtaining tail all 10 times)

= 1 - (1/2)^10

= 1023/1024

Therefore , probability is 1023/1024