4,950 If you pair up 1+99, 2+98, 3+97 and so on up to 49+51, you will have 49 pairs each adding to 100, and the number 50 which hasn't been included.
49x100 + 50 = 4950
It is 4950.
99^2 == 9,801
100
The numbers must average 33, so the answer is 32, 33 and 34.
Smallest will be 10 Biggest will be 99
9 and 9018 and 8127 and 7236 and 6345 and 54
99^2 == 9,801
The 3-digit numbers are all the counting numbers from 100 to 999.That's (the first 999 counting numbers) minus (the first 99 of them).There are 900 of them.
9801 * The sum of the first two odd numbers (1+3) is 4, or 22 * The sum of the first three odd numbers (1+3+5) is 9, or 32 * The sum of the first four odd numbers (1+3+5+7) is 16, or 42 * ...and so on So the sum of the first 99 odd numbers, using the pattern above, would be 992 or 9801.
10,11,12,13,...,99
The sum of all odd numbers 1 through 99 is 9,801.
Their sum is 99.
The highest 3-digit number is 999. It's the 999th counting number.The first 99 counting numbers have fewer than 3 digits.So there are (999 - 99) = 900 positive 3-digit numbers.The first is 100, the last is 999.100 + 999 = 1,099101 + 998 = 1,099102 + 997 = 1,099...There are (900/2) = 450 pairs; each pair adds up to 1,099.The sum of all pairs is (450 x 1,099) = 494,550 .
100
4950
n/2(n + 1) = 49½ x 100 = 4950
You're describing all of the counting numbers from 100 to 999.That's all of the counting numbers up to 999, except for the first 99.So there are 900 of them.
2500