Sum of the numbers from 1 to 18 is  Choose the correct answer.
A) 210
B) 171
C) 220
D) 105
E) None of these
Explanation: Sum of first n natural numbers = 1 + 2 + 3 + ..... n = n(n+1)/2   Substitute n = 18.   So S20=18Ã—19/2=171   Correct Option: 171
<result>B</result>
Sum of the numbers from 1 to 18 is