To find the last but one digit in the product of the first 75 even natural numbers, we need to consider the units digit of each number. Since we are multiplying even numbers, the product will end in 0. Therefore, the last but one digit (tens digit) will depend on the multiplication of the tens digits of the numbers. The tens digit will be determined by the pattern of the tens digits of the even numbers being multiplied.
Oh, dude, there are 90 three-digit palindromic numbers. You see, a three-digit palindrome has the form "ABA," where A and B can be any digit from 1 to 9. So, you just multiply the possibilities for A and B, which is 9 choices each, and voilà, you get 9 x 10 = 90. Easy peasy, lemon squeezy!
You end it when all the numbers are prime.
All even numbers are divisible by 2. The even numbers are those numbers which end with one of the digits {0, 2, 4, 6, 8}.
All even numbers (numbers evenly divisible by 2) will end with 2, 4, 6, 8, or 0.
No, there are composite numbers that end in every other digit.
13,23,33,43,53,63,73,83,93
All of them. There are roughly 45,000 5-digit odd numbers. None of them end in 0.
31 and 41.
900 numbers
11, 31, 41
When you square a number, the final digit is the final digit of the 'one's' number squared. Since the only single digit numbers squared which ends in 6 are 4 and 6, the answer is either 4 or 6 (a calculator tells me it is 6) 0 squared is 0. All numbers ending in 0 when squared will end in 0. 1 squared is 1. All numbers ending in 1 when squared will also end in 1. 2 squared is 4. All numbers ending in 2 when squared will end in 4. 3 squared is 9. All numbers ending in 3 when squared will end in 9. 4 squared is 16. All numbers ending in 4 when squared will end in 6. 5 squared is 25. All numbers ending in 5 when squared will end in 5. 6 squared is 36. All numbers ending in 6 when squared will end in 6. 7 squared is 49. All numbers ending in 7 when squared will end in 9. 8 squared is 64. All numbers ending in 8 when squared will end in 4. 9 squared is 81. All numbers ending in 9 when squared will end in 1. So square numbers can only end with 0, 1, 4, 5, 6 or 9.
There are 9 of them.
Any digit is possible.
Even.Work:Even numbers always end with a digit of 0, 2, 4, 6 or 8Odd numbers always end with a digit of 1, 3, 5, 7, or 9
There are 168 = 4,294,967,296 such numbers.
110.All the 500s start with a 5 so that is 100 numbers that start (or end) with a 5.Of the 400s, only those which ends with a 5 will do which are 405, 451, ..., 495. ie once for each possible tens digit; the tens digit can be one of 0, 1, ..., 9, ie one of 10 values, so there are a further 10 numbers that (start or) end with a 5.making 100 + 10 = 110 numbers in all.