Sum of the even numbers below 71 is ______ 

Given:

Sum of even numbers below 71

Formula used:

Sum of first n even numbers = n(n+1)

Where n is the number of even numbers

Calculation:

The even numbers below 71 are: 2, 4, 6, ..., 70

The largest even number below 71 is 70, and it is the 35^th even number (since 70/2 = 35).

⇒ n = 35

⇒ Sum of first 35 even numbers = 35(35+1)

⇒ Sum = 35 × 36

⇒ Sum = 1260

∴ The correct answer is option (1).