(1+100)* (100/2) = 5050 |
(25+1)×25÷2 = 325
n/2[2a+(n–1)d], where 'a' is the first number of the AP, 'd' is the difference between the numbers, and 'n' is the amount of numbers in the AP
To get to the other side..
Soldiers: To get from the left to the right
John Winger: He stepped out of rank, got hit by a tank
Soldiers: He ain't no chicken no more
Dropping down on a map, you'd reach Ecuador.