Question
Question: A coin is tossed successively three times. The probability of getting exactly one head or 2 heads, i...
A coin is tossed successively three times. The probability of getting exactly one head or 2 heads, is
A
41
B
21
C
43
D
None of these
Answer
43
Explanation
Solution
Required probability
=3C1(21)1⋅(21)2+3C2(21)2⋅(21)1=83+83=86=43 .