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How many seven digit numbers can be formed with the digitis 1 2 4 7?
Wiki User
∙ 15y ago
This answer is based on assumptions that indicate we want the size of a set S of numbers, the five smallest of which are 1,111,111
1,111,112
1,111,114
1,111,117
1,111,121
and the two largest of which are 7,777,774
7,777,777
The following two numbers would therefore not be in S: 1
777,777 The answer is: 47 = (4x4x4x4x4x4x4) = 16,384
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∙ 15y ago
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HOW MANY five digit numbers are there with distinct digits?
First digit can be any of nine (not "0"), second can also be any of nine, third any of eight, fourth any of seven and fifth any of six, that is 9 x 9 x 8 x 7 x 6 = 27216 such numbers.
The probability that a number selected from random between 100 and 999 both inclusive will not contatin the digit 7?
For me I think it is conceptually easier to think about the probability that the number will contain the digit seven (and the probability that it does not contain the digit 7 is simply one minus the probability that it does). P(number will contain 7) = P(number is in the seven hundreds) + P(number is not in seven hundreds)*[P(number is in the X hundred seventies)+P(number is not in the X hundred seventies)*P(number ends in seven)] So essentially I am considering all of the numbers in the range that start with seven (i.e., are in the seven hundreds), then all of the numbers in the range that aren't in the seven hundreds but have a 7 in the tens place (i.e., the 170s, 270s, etc., and finally all the numbers that don't have a 7 in the hundred or tens place, but that end in 7). Plugging the numbers into my formula above, I get (100/900)+(800/900)*((10/100)+(90/100)(1/10)) = 7/25 is probability that the number does contain a 7, and 1-(7/25)=18/25 is probability that it does not.
What is the value of the digit 7 in the number 18.79?
The digit 7 is in the tenths place, therefore its value is 7/10 (or seven tenths).
What is the probability that a seven-digit phone number contains the number 7?
Best way to answer this question is by figuring out the probability of a phone number not containing the number 7. There are 9 other numbers that are not a 7, so odds of each digit not being a 7 is 90%. For a 7-digit number, calculation would be 0.9*0.9*0.9*0.9*0.9*0.9*0.9 or 0.9^7. This equals 47.8%, which means the odds of a phone number containing at least one 7 is 100% - 47.8%, which is 52.2%. But phone numbers do not begin with 0 or 1, so if we account for that, the odds of the first digit not being a 7 is 7/8, not 9/10. We replace the first 0.9 with 0.875, and the result is 53.5%. There are other scenarios we can take out, like numbers that begin with 555, but I'll just leave it at that.
Try to put the numbers 1 to 7 in the seven diamonds below so that the numbers in each row of three diamonds add up to 10 Each number can be used only once?
There are no seven diamonds below.
How many 3 digit numbers are formed using the digits 164?
seven which are 146 164 416 461 614 641
What is the digit of seven numbers?
1 million 1,000,000
How many two digit numbers can you form using the digits 1235679 with repetition allowed?
You have seven different digits (symbols) to choose from, so you can form seven different one digit numbers and 7×7=72=49 different two digit numbers.
What 3 digit numbers have one to seven as factors?
420 and 840
How many 3 digit numbers are there that contain at least 1 seven?
252
How many numbers between 100 and 300 have a digit sum of 4?
Seven of them.
How many different telephone numbers can be formed from a seven digit number if the first and last digit cannot be zero?
The number of possibilities is 9 x 10 x 10 x 10 x 10 x 10 x 9 = 8,100,000.
How many seven-digit telephone numbers are possible if the first two digits cannot be ones or zeros?
That makes:* 8 options for the first digit * 8 options for second digit * 10 options for the third digit * ... etc. Just multiply all the numbers together.
What is remainder if the face value of the digit at the lakhs place is subtracted from the place value of the digit at the lakhs place in the smallest seven-digit number formed by using all the digits?
199998
How many seven digit numbers are there?
9,000,0009,999,999 is the last 7 digit number1,000,000 is the first 7 digit numberwhen you subtract the first from the last and add one you get the above answer.
Odd numbers in the seven hundreds?
Same as the odd numbers anywhere else, except the first digit is always "7"
How do you spell numbers digit by digit?
you say one number first then the other one for example 789 you say seven eight and then nine
