Find the total number of one,two and three-digit prime numbers that can be formed using the digits 2,3,5 and 7,No digit is to be used more than once in a number
ur just dumb. how the hell is 25, 35, 32, 52, 72, or 75 prime?
There are 10 numbers. 2,3,5,7,23,37,53,73
Isn’t 79 prime tho
To find the total number of one, two, and three-digit prime numbers that can be formed using the digits 2, 3, 5, and 7 without repeating any digit, we can follow these steps:
1. Identify the possible one-digit prime numbers: The digits 2, 3, 5, and 7 individually are prime numbers. Therefore, there are four one-digit prime numbers.
Primes: 2, 3, 5, 7
2. Consider the two-digit prime numbers: To create a two-digit prime number, the last digit cannot be 2 or 5 because these are the only possible digits that end two-digit prime numbers formed using 2, 3, 5, and 7. So, the possible pairs are (2, 3), (2, 7), (3, 2), (3, 7), (5, 2), (5, 3), (7, 2), (7, 3). However, one of the pairs, (2, 3), is not a two-digit prime number (23 is not prime). Hence, there are seven options for two-digit prime numbers.
Primes: 23, 37, 53, 73, 22, 27, 32
3. Determine the three-digit prime numbers: Following the same logic as step 2, to form a three-digit prime number using 2, 3, 5, and 7 without repetition, the last digit must be 3 or 7. The other two digits can be any of the four given digits. There are a total of eight possible combinations: (2, 3, 7), (2, 7, 3), (3, 2, 7), (3, 7, 2), (5, 3, 7), (5, 7, 3), (7, 2, 3), (7, 3, 2). Note that one of these combinations, (2, 3, 7), results in a non-prime number (237 is not prime). Thus, there are seven three-digit prime numbers.
Primes: 237, 273, 357, 375, 537, 573, 732
4. Count the total number of prime numbers: Adding up the results from step 1, 2, and 3 yields a total of four one-digit primes, seven two-digit primes, and seven three-digit primes.
Total: 4 + 7 + 7 = 18
Therefore, there are 18 one, two, and three-digit prime numbers that can be formed using the digits 2, 3, 5, and 7 without repeating any digit.
they will have to end in 3 or 7
1-digit: 2,3,5,7
2-digit: 13, 17, 23, 37, ..., 73
3-digit: similarly, but go online and look up a table of primes to pick them out.
dumb*
Me a piece of ...
There are 9 numbers. 2,3,5,7,23,53,73,257, and 523.
im trying to type dum. b
bro, there's more then 10 smh...
2,3,5,7,23,25,27,32,35,37,52,53,57,75,73,72
bruh