The first 3 digit number divisible by 19 is 114 (= 19 x 6) The last 3 digit number divisible by 19 is 988 (= 19 x 52) That means that there are 52 - 6 + 1 = 47 three digit numbers that are divisible by 19.
19?
It depends which one digit numbers are used. The ten can be any digits from -9 to 9, covering 19 different numbers. If you pick one of those 19 numbers ten times that would be 6131066257801 different possibilities of the number of one digit sets you could make.19*19*19*19*19*19*19*19*19*19=6131066257801
100-199 has 19 numbers200-299 has 100 numbers300-399 has 19 numbers400-499 has 19 numbers500-599 has 19 numbers600-699 has 19 numbers700-799 has 19 numbers800-899 has 19 numbers900-999 has 19 numbers(8x19)+100 = 152 + 100 = 252252 three digit numbers contain the digit 2
it is 3
The first 3 digit number divisible by 19 is 114 (= 19 x 6) The last 3 digit number divisible by 19 is 988 (= 19 x 52) That means that there are 52 - 6 + 1 = 47 three digit numbers that are divisible by 19.
19?
19
It depends which one digit numbers are used. The ten can be any digits from -9 to 9, covering 19 different numbers. If you pick one of those 19 numbers ten times that would be 6131066257801 different possibilities of the number of one digit sets you could make.19*19*19*19*19*19*19*19*19*19=6131066257801
To calculate the 2 digit numbers divisible by 19, you simply start out by multiplying 19 by 2, then by 3, etc., until you reach a number that is 99 or less. The reason you have do it until you reach a number that is 99 is because after 99 you have a 3 digit number. 19 x 2 = 36 19 x 3 = 57 19 x 4 = 76 19 x 5 = 95 So, the 2 digit numbers divisible by 19 are 36, 57, 76, 95
In the number 499, there are two twos. The first two is in the hundreds place, representing 200. The second two is in the units place, representing 2.
Oh, dude, a 19-digit number is called a "19-digit number." I mean, it's not like they have a fancy name or anything. It's just a number with 19 digits, like, nothing too exciting. So yeah, that's what it's called.
#include<iostream> #include<array> #include<sstream> std::array<int,10> get_frequency (int range_min, int range_max) { if (range_max<range_min) std::swap (range_min, range_max); std::array<int,10> digit {}; for (int count {range_min}; count<=range_max; ++count) { std::stringstream ss {}; ss << count; std::string s {}; ss >> s; for (auto c : s) { ++digit[c-'0']; } } return digit; } int main () { std::array<int,10> digit {}; digit = get_frequency(1, 89); std::cout << "In the range 1 to 89...\n"; for (int d {0}; d<10; ++d) { std::cout << "\tthe digit " << d << " appears " << digit[d] << " times.\n"; } } Output: In the range 1 to 89... the digit 0 appears 8 times. the digit 1 appears 19 times. the digit 2 appears 19 times. the digit 3 appears 19 times. the digit 4 appears 19 times. the digit 5 appears 19 times. the digit 6 appears 19 times. the digit 7 appears 19 times. the digit 8 appears 19 times. the digit 9 appears 9 times.
100-199 has 19 numbers200-299 has 100 numbers300-399 has 19 numbers400-499 has 19 numbers500-599 has 19 numbers600-699 has 19 numbers700-799 has 19 numbers800-899 has 19 numbers900-999 has 19 numbers(8x19)+100 = 152 + 100 = 252252 three digit numbers contain the digit 2
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it is 3
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