1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
svet-max [94.6K]
3 years ago
9

A prime number less than 100 is selected randomly. what is the probability that its square has units digit $7$?

Mathematics
1 answer:
liberstina [14]3 years ago
4 0
Any number ends with 0, 1, 2, 3, 4, 5, 6, 7, 8 or  9

Given any number. The square of this number is the last digit of square of the original numbers units digit.

For example

23*23 ends with 9 (3*3=9)

149*149 ends with 1 (9*9=81)

2564*2564 ends with 6 (4*4=16) 

and so on

so all the possible unit digits of a square number are {0, 1, 4, 5, 6, 9}

because:

0*0= 0 ; 1*1=1; 2*2=4; 3*3=9; 4*4=16; 5*5=25, 6*6=36; 7*7=49; 8*8=64, 9*9=81

Thus, the probability that the square of a number selected from any set of numbers being 7, is 0.


Answer: 0
 

You might be interested in
Rewrite 6√2 in the simplest form
mylen [45]
6<span>√2 is already in it's simplest form as a radical.


</span>
5 0
3 years ago
Represent each sum as a single rational number.<br> 7 + (1/9)
Nady [450]

Answer:

Do u have a picture of it

Step-by-step explanation:

5 0
3 years ago
Holly has 56 peices of paper and 8 paper clips. If she clips the same amount of paper together with each paper clip, how many pe
dedylja [7]

Answer:

56/8 = 7 pieces of paper

Step-by-step explanation:

3 0
3 years ago
Which set of ordered pairs could be generated by an exponential function?
KIM [24]
Hello,

Answer C with y=2^x

Download xls
8 0
3 years ago
Read 2 more answers
Juan ran all the way around a circular track one time. The diameter (d) of the track is 60 meters. The formula for circumference
kenny6666 [7]

circumference is C = πd, d = diameter.

we know the diameter is 60, so one time around the track is just C = π60 which if you plug that in your calculator, we get C ≈ 188.4955592153876.

5 0
3 years ago
Read 2 more answers
Other questions:
  • WILL GIVE BRAINLIEST!!!!!!!!-What is the recursive rule for this geometric sequence?
    6·2 answers
  • How do I factor and simplify this?
    12·1 answer
  • I need help solving number 11 please.
    13·1 answer
  • Help me ‼️‼️‼️please and thank uuuuu
    9·1 answer
  • Pls help to get 100points
    10·2 answers
  • Help plz i’ll give extra points
    8·2 answers
  • The perimeter of a square is 80 - 64y units.Which expression can be used to show the side length of one side of the square.
    7·2 answers
  • The graph of y= f(X) is shown below, what point could be used to find f(3)?
    11·1 answer
  • Find the measure of KL<br><br> A. 10<br> B. 5<br> C. 7<br> D. 8
    8·1 answer
  • PLEASE HELP ME I DON’T UNDERSTAND
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!