IBM
Company
Numerical Ability
Probability
Three unbiased coins are tossed.What is the probability of getting at least 2 heads?
A. 1/2 B. 1/4
C. 1/3 D. 1/8
Read Solution (Total 2)
-
- total outcomes are 2^3=8
getting at least two heads=(H,H,H)(H,T,H)(H,H,T)(T,H,H)
ans is=4/8=1/2 - 12 years agoHelpfull: Yes(20) No(0)
- 1/2 is the ans
when 3 coins are tossed the out comes are=2^3=8
then getting atlest 2 heads are=(THH),(HTH),(HHT),(HHH)=4ways
then the probabilty =4/8=1/2 - 12 years agoHelpfull: Yes(6) No(0)
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