MediumMath and Logic
What is the sum of all the integers from 1 to 100?
Riddle
What is the sum of all the integers from 1 to 100?
Choose an answer
A.5,000
B.5,100
C.10,000
D.5050
Hint: It's a word with 0 letters, starting with "5".
Answer
5050
Why this is the answer
Use the formula for the sum of an arithmetic series: n(n+1)/2. For n=100, it is 100*101/2 = 5,050.
This riddle is filed under Math Riddles and rated Medium.