Multiple choice

Look at the shown series. 2, 6, 12, 20, ....

What is the sum of 5th and 6th terms of the above series?

  1. 42

  2. 50

  3. 72

  4. 64

  5. 62

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the series: 2, 6, 12, 20, ..., each number is written as the sum of its square and the number itself. 2 = 12 + 1 6 = 22 + 2 12 = 32 + 352 + 5 = 25 + 5 = 30 62 + 6 = 36 + 6 = 42 Hence, their sum would be 72.