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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 mean median and mode of 5 9 6 6 11 8 4?
The mean of those seven numbers is (5 + 9 + 6 + 6 + 11 + 8 + 4)/7 = 7 The median of those seven numbers is 6. The mode of those numbers - the only number which appears more than once - is 6.
What is the probability of getting a diamond and a black 7?
The probability of getting a diamond and a black seven is zero. Diamonds are red.
All seven-digit telephone numbers in a town begin with 245 how many telephone numbers may be assigned in the town if the last 4 digits do not begin or end in a zero?
There are seven positions: _ _ _ _ _ _ _ Each must be filled by number 0-9 and numbers can be repeated. The first three positions must be 2,4,5, therefore, 2 4 5 _ _ _ _ For the other for positions, the 4th and 7th position cannot be 0 (therefore only 9 possibilities: 1-9) and the 5th and 6th position can be any number (10 possibilities: 0-9). Therefore, the total number of possibilities is 9 * 10 * 10 * 9 = 8100 since the positions are independent.
What are unfactorable numbers called in simple terms?
Hopefully not being too obvious here, I have been frustrated (after searching each of seven home dictionaries, crosswordbooks, "word finders", etc., etc,....) I'll just say the following. Anyone who wishes to correct me, does so at no peril of my wrath: Unfactorable numbers are known as Prime Numbers. OK? Thanks for comments--- Mr. C. well a unfactorable number is, to use the prefix meaning, a number that can't be factorised or doesn't have any factors and nosuch number exists as 0=any number times by 0, and 1=1 times itself. both numbers above have been said to not fit into either the prime of composite number groups
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 with only each number only being used once?
First Row 7,6 Second row 4,1,5 Third row 3,2
Is seven a prime number?
Yes seven is a prime number and the only numbers that will go in to seven is one and seven.
How many seven digit numbers contain the number seven at least once?
To find the total number of seven-digit numbers that contain the number seven at least once, we can use the principle of complementary counting. There are a total of 9,999,999 seven-digit numbers in total. To find the number of seven-digit numbers that do not contain the number seven, we can count the number of choices for each digit (excluding seven), which is 9 choices for each digit. Therefore, there are 9^7 seven-digit numbers that do not contain the number seven. Subtracting this from the total number of seven-digit numbers gives us the number of seven-digit numbers that contain the number seven at least once.
What numbers are not divisible by 7?
There is an infinite number of numbers that are not divisible by seven!
How to find the multiples of the number seven?
you whole numbers that seven go in to
How many prime numbers are in the seven times tables?
number of prime numbers which are in the seven times tables: 1 prime numbers are in the seven times tables: 7 only
How many combinations of six numbers can be had from seven numbers?
The number of combinations of six numbers that can be made from seven numbers will depend on if you can repeat numbers. In all there are over 2,000 different numbers that can be made.
Are the number seven and 2two prime numbers?
Yes.
Is seven eight's a rational number?
7/8 is a rational number because rational numbers are fractions, numbers that terminate, numbers that repeat.
What is two and seven eighths as a whole number?
Mixed numbers can't be whole numbers.
What does 1000000 dividedby seventy equal?
there are seven numbers in the number
What is the smallest number divisible by seven prime numbers?
510510
