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CBSE Class 9 Answered

Three unbiased coins are tossed together . Find the probability of getting 1. Two heads. 2. At least two heads. 3. No heads
Asked by Tejas Kulkarni | 28 Feb, 2014, 12:41: AM
answered-by-expert Expert Answer
When 3 unbiased coins are tossed, the sample space is {HHH, HTH, HHT, THH, THT, TTH, HTT, TTT] = 8
 
Event of getting two heads = {HTH, HHT, THH} = 3
 
P(Two Heads) = 3/8
 
Event of getting At least two heads (two or more than 2 heads) = {HHH, HTH, HHT, THH} = 4
 
P(At least Two Heads) = 4/8 = 1/2
 
Event of getting No heads = {TTT} = 1
 
P(No Heads) = 1/8
 
 
Answered by | 28 Feb, 2014, 09:56: AM

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