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  1. Find the sum of even numbers below 281. ?
    1. 19740
    2. 19750
    3. 19760
    4. 19730
Correct Option: D

As, n is odd.
∴ Sum of even number = [(n - 1)/2 ] [ (n + 1 )/2]
= 280/2 x 282/2 = 19740


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