Multiple choice

What is sum of $30$ terms of the given arithmetic series: $12 + 24 + 36 +...? $

  1. $2580$
  2. $3580$
  3. $4580$
  4. $5580$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sum of n terms = (n/2) * (2a + (n-1)d). n=30, a=12, d=12. Sum = (30/2) * (24 + 29*12) = 15 * (24 + 348) = 15 * 372 = 5580.

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