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ICSE Class 10 Answered

Two different dice are thrown together.Find the probability of getting:i)sum 7, ii)sum<_3 and iii)sum<_10
Asked by debabrata111111 | 12 Aug, 2018, 01:31: AM
answered-by-expert Expert Answer
the sample space will be
S ={(1,1),(1,2),(1,3),(1,4),(1,5),(1,6),(2,1),(2,2),(2,3),........,(6,1),(6,2),(6,3),(6,4),(6,5),(6,6)}
n(S)=36
A: event of getting sum 7 = {(1,6),(2,5),(3,4),(4,3),(5,2),(6,1)}
n(A)=6
P(A)=6/36=1/6
similarly for
sum <=3, look for sum 3 and 2
sum <=10, look for sum 10,9,8,7,6,5,4,3,2

Answered by Arun | 13 Aug, 2018, 11:51: AM
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