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The Number of Elements in a List
If m and n are integers and m ≤ n, then there are n − m + 1 integers from m to n
inclusive.
m = 100, n = 999
according to theorem above
999 - 100 + 1 = 900
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How many 3 digit numbers are under 500?
The 3 digit numbers under 500 are 100 through 499.
How many 3 digit numbers can be made with numbers 1 - 9?
999-111=888 888 3 digit numbers can be made with numbers between 1 - 9
How many four digit numbers can be formed out of 123 if a digit can be repeated?
There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.
How many 3-digit numbers can made using the digits 2 3 4?
If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.
How many 3 digit numbers are divisible by 7?
The smallest 3-digit multiple of 7 is 105 = 15*7 The largest 3-digit multiple of 7 is 994 = 142*7 So there are 142-14 = 128 3-digit multiples of 7, ie 128 3-digit numbers that are divisible by 7.
How many 3 digit numbers are divisible by 6 in all?
There are 151 3-digit numbers that are divisible by 6.
How many 3 digit ascending numbers?
There are 84 such numbers.
How many 3 digit numbers are under 500?
The 3 digit numbers under 500 are 100 through 499.
How many 3 digit numbers can be made with numbers 1 - 9?
999-111=888 888 3 digit numbers can be made with numbers between 1 - 9
How many 3 digit numbers are rolling?
6
How many 3 digit number are divisible by 5?
There are 180 3-digit numbers divisible by five.
How many 3 digit numbers can be formed from the digits 357 with any digit repeated?
27 three digit numbers from the digits 3, 5, 7 including repetitions.
How many 3 digit numbers have a digit sum of 27?
Only one . . . 999 .
How many four digit numbers can be formed out of 123 if a digit can be repeated?
There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.
How many two - digit numbers are divisible by 3?
There are 30 such numbers.
How many 3-digit number are multiples of 18?
There are 49 3-digit numbers - from 108 to 990 inclusive.
How many 4-digit numbers can be formed by the digits 2 4 6?
81 As there are no limits stated then you can have a number comprising a repeated single digit (such as 2222), two pairs of numbers (e.g. 2244) or three different numbers (such as 2462). The first digit can be one of any of the 3 numbers. The second digit can be one of any of the three numbers, as can the third digit and also the fourth. Then you can have 3 x 3 x 3 x 3 = 81 different 4-digit numbers using the three given numbers.
