There are 3,999 even numbers between 1,000 and 9,000.
There are 49 even numbers between 1 and 99.
3
they are 20
There are many, many more odd prime numbers than even prime numbers; there is only 1 even prime number, namely 2, whereas the odd prime numbers are 3, 5, 7, 11, ...
1, 7, 157, 1099.
Observe that: 100+999 =1099, 101 + 998 = 1099 up to 549+550=1099. So 1099 * (1000-100/2) or 1099 * 450 (450 pairs of numbers that sum to 1099) or 494,500. This is a variant of the method exposed in the "Gauss Anecdote"
1099
There are seven: 1057, 1064, 1071, 1078, 1085, 1092, 1099.
How many even numbers are there between 165 and 345
4,000 even numbers, 4,000 odd numbers.
Formula: Step 1) 834 + 1099 +775 + 900 + 970 = 4578 Add up all the numbers, and get the total Step 2) 4578 / 5 = 915.6 Take the answer and divide it by how ever many numbers you added up in step 1 In this case there are 5 different numbers. Step 3) 915.6 is the mean.
100000000000 kantutan
There are 100 even numbers between 1 and 200 (inclusive).
There are 3,999 even numbers between 1,000 and 9,000.
There are 49 even numbers between 1 and 99.
There are 18 even numbers between 1 and 37