Find the sum 1 + 2 + 3 + ... + 100. Give a complate explanation.
1 + 2 + 3 + 4 +....................95 + 96 + 97 + 98 + 99 + 100
(100 +1) + (99 +2) + (98+3).........
101 + 101 + 101.........you have 50 pairs that make up 101.
101 x 50 =5050 - This is called "Gauss's Method"
