50
They are 210, 330, 390 and 462.
There are 3 prime numbers between 70 and 80: 71 73 79.
ther are loads of numbers that are bigger then 500, less then 50000 and a multible of 100 including: 600, 700, 800, 900 1000, 1100, 1200,1300, 1400 etc.
501
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Infinitely many.
There are 499 whole numbers that fit those conditions.
There is no limitation given to the number of digits in the number, thus: For 3 digit numbers: to be less than 500 the first digit can be only one of {1, 2, 3, 4} leading to 4 × 5 × 4 = 80 numbers For 2 digit numbers: they are all less than 500, and there are 6 × 5 = 30 numbers For 1 digit numbers: they are all less than 500, and there are 6 numbers Thus there are in total 80 + 30 + 6 = 116 numbers that can be made form the digits {1, 2, 3, 4, 5 ,6} without repetitions that are less than 500.
50
infinite-500
They are 210, 330, 390 and 462.
None. There is only one number in 500. That number is "500" and it is not a prime number.There are 94 prime numbers that are smaller than 500.
There are 3 prime numbers between 70 and 80: 71 73 79.
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
345
250 less than 500 = 500 - 250 500 - 250 = 250