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Probability related Questions by Balaji
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Probability related Questions by Balaji
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Balaji
Senior Member
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08-08-2014, 11:30 PM
Düzenlendi
#1
N is a three digit no that is multiple of 7 what is the prob that it will be multiple of 5
a) 1/5
b) 11/54
c) 13/64
d) 13/66
answer choice c
solution
there are 26 such numbers so
probability = 26/128
=13/64
Balaji
Senior Member
Posts:
107
Threads:
71
Reputation:
43
08-08-2014, 11:33 PM
Düzenlendi
#2
consider a 3 digits number abc. what is the probability that a>b>c ?
a) 1/12
b) 1/6
c) 2/15
d) 1/7
answer choice d
solution
denominator = total no of 3 digit no = 9*10*10
=900
required probability = 84+36/900=120/900=2/15
Balaji
Senior Member
Posts:
107
Threads:
71
Reputation:
43
08-08-2014, 11:37 PM
Düzenlendi
#3
An unbiased coin is tossed 16 times what is the probability of getting more heads than tails ?
a) 26333/65536
b) 26333/32768
c) 1/2
d) 26283/65536
answer choice a
solution
prob (more heads than tails) = (1- 16c8*(0.5)*16)/2
=26333/65536
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