Qualification > Math
IGCSE MATHS Doubts
Ghost Of Highbury:
--- Quote from: saleemsamer on May 17, 2010, 12:19:25 pm ---O/N 06 p4 q5 b and c with explanation plz ???
--- End quote ---
bi) Hits , Hits and Hits. = 1/3*1/3*1/3 = 1/27
bii) The probability that she never hits is 2/3*2/3*2/3 = 8/27
1 - 8/27 = 19/27
c)i) Hits in 4th throw = Doesnt hit, Doesnt Hit, Doesnt Hit, Hits.
Doesnt hit = 1- 1/4 = 3/4
3/4 * 3/4 * 3/4 * 1/4 = 27/256
cii) This means that he "Doesnt hit" till the nth throw. Till the nth throw means that he doesnt hit for the first (n-1)th throw.
LIke (ci), u multiply 3/4 for (n-1) times and multiply it with 1/4
Therefore, (3/4)(n-1) * 1/4
saleemsamer:
--- Quote from: A@di on May 17, 2010, 12:29:40 pm ---bi) Hits , Hits and Hits. = 1/3*1/3*1/3 = 1/27
bii) The probability that she never hits is 2/3*2/3*2/3 = 8/27
1 - 8/27 = 19/27
thx but wat bout c? :)
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Ghost Of Highbury:
--- Quote ---bi) Hits , Hits and Hits. = 1/3*1/3*1/3 = 1/27
bii) The probability that she never hits is 2/3*2/3*2/3 = 8/27
1 - 8/27 = 19/27
thx but wat bout c?
--- End quote ---
check again.
saleemsamer:
--- Quote from: A@di on May 17, 2010, 12:32:58 pm ---check again.
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lol Thank You :D
Ghost Of Highbury:
--- Quote from: saleemsamer on May 17, 2010, 12:33:51 pm ---lol Thank You :D
--- End quote ---
No problemo
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