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How many numbers are there between 100 and 1000 which have exactly one of their digits as 7?
I ask you...
Call it 100 - 999 so that we have exactly 900 numbers.
The first digit of a number x from this range can be any of nine digits (1-9). The second two places can be filled by any of ten digits (0-9).
Therefore the probablility that only the first digit is a 7 is 1/9 x 9/10 x 9/10 = 81/900.
The probability that only the second digit is a 7:
8/9 x 1/10 x 9/10 = 72/900
The probability that only the third digit is a 7:
8/9 x 9/10 x 1/10 = 72/900
Adding the three mutually exclusive probabilities gives an overall proportion of 225/900, so with 900 numbers in the range there must be 225 with the digit 7 occurring only once. ") ") ") ") ") ") ") ") ") ") ") ") ") ") ") "() "() "() "() "() "() "() "() "() "()
No it is not
What else can I help you with?
How many digits are there between 1 and 1000?
Not couting 1 and 1000, there would be 998 numbers.
What is the sum of all the digits between 1000 and 2000?
The sum of all the integers between 1,000 and 2,000 is 1,498,500.
What is a 4 digit salary?
Anything that has 4 digits - any number between 1000 and 9999.
How many digits on 1000 factorial?
2625
How many square numbers are there between 0 and 1000?
sqrt(1000) = 31.62... So there are 31 (or 32 including 0 = 02).
How many numbers are there between 0 and 1000 which have exactly one of their digits as 5?
it s 243..
How many digits in the numbers between 1000 and 1128?
123
How many digits are there between 1 and 1000?
Not couting 1 and 1000, there would be 998 numbers.
How many numbers between 100 and 1000 have their digits adding up to 5?
16
How many numbers between 100 and 1000 have 2 as the units digits?
91.
How many numbers are there between 100 and 1000 such that atleast one of their digits is 7?
252 of them.
How many prime numbers are there whose square has 5 or 6 digits?
solution: we know that there are 25 prime numbers are between 1-100 and 168 prime numbers less than 1000. 100 x 100=10000(5 digits) 999 x 999=998001(6 digits) 1000 x 1000=1000000(7 digits) so our answer should be same as the number of prime numbers between 100 to 999. hence, 168-25=143. 143 prime numbers will be there less than 1000 whose square has 5 or 6 digits.
How many numbers between 1000 and 5000 divide exactly by 23?
174
How many even numbers between 1 and 1000?
There are exactly 50 even numbers if you include 100. There are exactly 50 odd numbers if you include 1.
How many numbers ar there between 500 and 1000 which have exactly one of their digits as 8?
start at 508 and add 10 until you reach 998. also include 580 680 780 and 980.
How many different whole numbers between 0 and 1000 have digits whose sum is 9?
999 are whole.
What are Armstrong numbers between 100 to 1000?
Well, sweetheart, Armstrong numbers, also known as narcissistic numbers, are numbers that are equal to the sum of their own digits raised to the power of the number of digits. In this case, the Armstrong numbers between 100 and 1000 are 153, 370, and 371. So, there you have it, darlin'. Hope that satisfies your curiosity.
