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16 Feb 2020, 23:55
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
66% (01:51) correct
34%
(02:12)
wrong
based on 134
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Palindrome is a number that reads the same from right to left as it does from left to right such as 13431. If a 5-digit number is chosen at random, what is the probability that it will be a palindrome?
a. 1/10
b. 1/90
c. 1/99
d. 1/100
e. 1/9
a. 1/10
b. 1/90
c. 1/99
d. 1/100
e. 1/9
18 Feb 2020, 15:03
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In terms of probability for a 5 number palindrome, the 2 first and last numbers must be the same which has a 1/10 probability, and the 2nd and 2nd to last numbers must be the same, also a 1/10 probability. To find the probability that a palindrome 5 number will occur at random, multiply the odds of the two conditions:
1/10 * 1/10 = 1/100
Answer=D
1/10 * 1/10 = 1/100
Answer=D
18 Feb 2020, 15:32
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ABCAB
A=1,2,3..9......9
B=0,1,2..9.....10
C=0,1,2...9.....10
9*10*10=900
There are 9*10*10*10*10=90000 5-digit numbers
900/90000= 1/100
Posted from my mobile device
A=1,2,3..9......9
B=0,1,2..9.....10
C=0,1,2...9.....10
9*10*10=900
There are 9*10*10*10*10=90000 5-digit numbers
900/90000= 1/100
Posted from my mobile device
