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Two digit number with 7 as unit digit 7 are:
17, 27, 37, 47,57,67,77,87,97
we know that in 27 sum of digits =2+7=9
for 57=> 5+7=12
87=> 8+7=15
so 27,57 and 87 are divisible by 3
77=7*11 so 77 is divisible by 7 and 11
Thus 4 no are not prime
So the Prime number are:
17,37,47,67 and 97
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How many two digit prime numbers have a units digit of 7 and what are the prime numbers?
17, 37, 47, 67, 97
What is the units digit of the product of the first 100 prime numbers?
0 Look at the product of the first 3 prime numbers: 2 x 3 x 5 = 30. Any number multiplied by 30 will have a 0 in the units digit. So, no matter how many prime numbers you are multiplying, if once you have a number ending in 0, all of the rest will end in 0.
How many 2 digit prime numbers are there?
there are 50 prime numbers between 1-100 and of them 2,3,5,7 are single digit so that would leave 46 double digit prime numbers between 1-100
How many 2 digit prime numbers are there whose unit digit is greater its tens digit?
Ten.
How many positive prime numbers have a ones digit of 5?
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
How many two digit prime numbers have a units digit of 7 and what are the prime numbers?
17, 37, 47, 67, 97
How many two digit prime numbers are there between 1-100 such that they have digit 7 in their units place?
There are 5 of them.
How many two digit prime numbers are there?
There are 21 two-digit prime numbers.
How many of the integers from 1 to 121 that have a units digit of 1 are prime?
The prime numbers with a units digit of 1 in the range 1 - 121 are :- 11, 31, 41, 61, 71 and 101.......making 6 primes in total.
What is the units digit of the product of the first 100 prime numbers?
0 Look at the product of the first 3 prime numbers: 2 x 3 x 5 = 30. Any number multiplied by 30 will have a 0 in the units digit. So, no matter how many prime numbers you are multiplying, if once you have a number ending in 0, all of the rest will end in 0.
How many prime numbers up to 100 have the number 9 as their units digit?
19 29 59 79 89 Five of them.
How many three digit numbers have odd prime number as 1st digit A prime number as 2nd digit and an odd number as 3rd digit?
There are 17 such numbers.
How many two-digit primes are there whose units digit is less than its ten digits?
There is no simple formula for that; I suggest you look up the prime numbers in a table of prime numbers, analyzing each prime number in the range 10-99 whether it fulfills this specific criterion.
How many 5 digit prime numbers are there?
An on-line prime number chart ended at 10007. There are many more charts available for download. So the answer is that there are many five digit prime numbers.
How many 2 digit prime numbers are there?
there are 50 prime numbers between 1-100 and of them 2,3,5,7 are single digit so that would leave 46 double digit prime numbers between 1-100
How many 2 digit prime numbers are there whose unit digit is greater its tens digit?
Ten.
How many 4 digit numbers are all made of prime numbers?
24 of them.
