A man is asked to say 3 digit number .
(a) What is the probabity of the first and last digit be equal?
( b) What I athe probability thay the last 2 digit no be zero?
(c) What is the probablity that the last digit is greater than the first digit ?
Answers
Answered by
0
Step-by-step explanation:
The given statement says that 5 digit numbers are made from 7 digits.
The probability of selecting 5 digits from 7 is given by
7
P
5
The odd numbers are 4 in number and thus 2 of them can be selected by
4
P
2
and the remaining three from the even numbers as
3
P
3
Thus the probability is given by : (
4
P
2
x
3
P
3
)/(
7
P
5
) =
7
2
Answered by
3
Answer: a)1\10
b)1\100
Step-by-step explanation:
a) three digit no: 100,101,......,999
Total no: (999-100)+1=900
Total pairs :99
P(first and last digit to be equal) =90÷ 100=1\10
b)100,200,300,400,500,600,700,800,900
P(last two digit be 0) = 9÷900= 1\100
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