Posted by karen on Saturday, August 11, 2012 at 5:03pm.
please help!
1.) A random digit from 1 to 9 (inclusive) is chosen, with all digits being equally likely. The probability that when it's squared it will end with the digit 1.
2.) A random number between 1 and 20 (inclusive) is chosen. The probability that its square root will not be an integer.

math  MathMate, Saturday, August 11, 2012 at 10:12pm
See response to:
http://www.jiskha.com/display.cgi?id=1344678011
and post if you need more explanations or would like to post your attempt.

math  karen, Sunday, August 12, 2012 at 5:37pm
thank you for your help!
can you check if it's correct?
1.) 1/9
2.) 4/2= 1/5

math  MathMate, Sunday, August 12, 2012 at 6:33pm
1.
Note that
21*21=441
49*49=2401
Does that give you a hint?
2.
The question looks for
"The probability that its square root will not be an integer"
so check your answer accordingly.

math  Anna, Thursday, August 21, 2014 at 11:27am
Question: why is it not 2/9? Since I know 1 squared will be 1, which ends in 1, but what about 9? 9 squared is 81, it ends in 1. So that makes 2/9 = 0.22

math  Anna, Thursday, August 21, 2014 at 11:30am
Question: why is it not 2/9? Since I know 1 squared will be 1, which ends in 1, but what about 9? 9 squared is 81, it ends in 1. So that makes 2/9 = 0.22
@MathMate
Answer This Question
Related Questions
 probability  please help! 1.) A random digit from 1 to 9 (inclusive) is chosen...
 Math  A number is chosen at random from among all 5digit numbers containing ...
 Math  In a table of random digits, each digit is to occur with a probability of...
 Math  I form a 3digit number at random from the digits 19. What is the ...
 Finite Math  Assume that 3 digits are selected at random from the set {1,3,5,6,...
 Statistics and Probability  The TriState Pick 3 lottery game offers a choice ...
 Math  A 3digit positive integer is selected at random. Find the probability ...
 Math  if the last digit of a weight measurement is equally likely to be any of ...
 math  A twodigit number is chosen at random.What is the probability that the ...
 math  Assume that 3 digits are selected at random from the set { 2, 5, 6, 8, 9...
More Related Questions