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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 10 digit hexadecimal numbers begin and end with F?
There are 168 = 4,294,967,296 such numbers.
Prime numbers less than 50 that end with the digit 1?
Oh, dude, you're making me do math now? Alright, let's see... So, prime numbers less than 50 that end with the digit 1 are 11, 31, and 41. Like, it's not rocket science, but I still had to use my brain for a second there.
Do any prime numbers end in 4?
No. If they end in 4, they are even numbers and divisible by 2, and therefore are not prime.
How can you tell 28655 not a prime number looking at the last digit?
All numbers ending in 0 and 5 are divisible by 5 and since 28655 ends in 5, it is divisible by 5 and therefore not prime.
