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Explanation for the answer to how many three digit prime numbers can be formed using only odd prime digits and digits may be used more than once?
The odd prime digits are 3, 5, and 7. but the final digit of your three-digit Prime number can't be 5. So there are only 18 combinations to check. You can list these numbers and start going through them to see which are prime. The easiest test is divisibility by 3 (sum the digits) and that quickly eliminates 7 of them. You are left with:
337
353
373
533
553x
557
577
733
737x
757
773
Of these, only two are not prime. I marked them with an "x". I used a table of primes to find these and don't know an easier way.
What else can I help you with?
How many 5 digit numbers can be formed from the digits 012 if any of the digits can be repeated?
500
How many 3 digit numbers can be formed from the digits 102987?
180 of them.
The total number of five digit numbers that can be be formed digits 12345 is?
It is 120 if the digits cannot be repeated.
How many 4 digit numbers can be formed from digits 1 2 3?
There are 34 = 81 numbers.
How many three digit numbers can be formed using the digits 873 and 6 without repetition?
I take it that you want to make three digits numbers with 8,7,3, and 6 without repetition. The first digit cane be selected from among 4 digits, the second from 3 digits, the third digit from 2, hence the number of three digit numbers that can be formed without repetition is 4 x 3 x 2 = 24
How many 4 digit numbers can be formed from digits 123456789?
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
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 5 digit numbers can be formed from the digits 012 if any of the digits can be repeated?
500
How many 4 digit numbers can be formed from the digits 7341 if none of the digits can be repeated?
24
How many 4 digit numbers can be formed from the digits 1234567 with no duplicate numbers?
840
How many 6 digit numbers can be formed using the digits 123456789?
There are 60480 numbers.
How many 3 digit numbers can be formed from the digits 102987?
180 of them.
How many 4 digit numbers can be formed from the digits 123456789?
There are 3024 of them.
How many 3 digit numbers can be formed from the digits 12345 if the digits cannot be repeated?
1 set
The total number of five digit numbers that can be be formed digits 12345 is?
It is 120 if the digits cannot be repeated.
How many 6 digits numbers can be formed from the digit 01357 and 9 which are divisible by 10 and no digit is repeated?
There are 5! = 120 such numbers.
How many 4 digit numbers can be formed from digits 1 2 3?
There are 34 = 81 numbers.
