The Sum of First 84 Even Numbers is

  1. 7140
  2. 7540
  3. 6720
  4. 8832
Monis Rasool Professor Asked on 2nd June 2015 in Maths.
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1 Answer(s)

Answer: (1) 7140
Explanation:-
First even number is 2,4,6,8, ………………………168

The sum of first even number = 2 + 4 + 6 + ………………….+ 168
Sum = (n/2) x (first number + last number)
then, first number = 2  and last number = 168

The sum of first 84 even number = (84/2) x (2 + 168)
= 42 x 170 = 7140

Hence, the sum of the first even number is 7140.

Anurag Mishra Professor Answered on 2nd June 2015.
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