+0  
 
0
46
1
avatar+41 

How many phone numbers can be made if the first digit must be 1, the second digit must be a number in the range 3-5, the third digit must be a number in the range (6-9), and the last seven digits can be any single digit number 0-9?

Marss  Nov 27, 2018

Best Answer 

 #1
avatar+20633 
+7

How many phone numbers can be made if the first digit must be 1,

the second digit must be a number in the range 3-5,

the third digit must be a number in the range (6-9),

and the last seven digits can be any single digit number 0-9?

 

 1) For the first digit, we have only one choice -- we must choose a 1.
 2) For the second digit, we have three choicees -- we must choose 3, 4, or 5.
 3) For the third digit, we have four choices -- we can choose 6, 7, 8, or 9.
 4) For the fourth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 5) For the fifth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 6) For the sixth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 7) For the seventh digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 8) For the eighth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 9) For the ninth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
10) For the tenth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .

 

1 X 3 X 4 X 10 X 10 X 10 X 10 X 10 X 10 X 10 = 120 000 000  possible numbers.

 

laugh

heureka  Nov 27, 2018
 #1
avatar+20633 
+7
Best Answer

How many phone numbers can be made if the first digit must be 1,

the second digit must be a number in the range 3-5,

the third digit must be a number in the range (6-9),

and the last seven digits can be any single digit number 0-9?

 

 1) For the first digit, we have only one choice -- we must choose a 1.
 2) For the second digit, we have three choicees -- we must choose 3, 4, or 5.
 3) For the third digit, we have four choices -- we can choose 6, 7, 8, or 9.
 4) For the fourth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 5) For the fifth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 6) For the sixth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 7) For the seventh digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 8) For the eighth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
 9) For the ninth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .
10) For the tenth digit, we have ten choices -- we can choose 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 .

 

1 X 3 X 4 X 10 X 10 X 10 X 10 X 10 X 10 X 10 = 120 000 000  possible numbers.

 

laugh

heureka  Nov 27, 2018

34 Online Users

avatar
avatar
avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.