Multiple choice general knowledge math & puzzles

Find the next : 0,0,2,6,12,?

  1. 30

  2. 25

  3. 20

  4. 32
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sequence follows the formula n^3 - n^2 (starting from n=1) or n(n-1)(n-2) is not quite right. The pattern is: 1^2-1=0, 2^2-2=2, 3^2-3=6, 4^2-4=12. Wait, the pattern is x_n = n^2 + n? No. It is: 0*1=0, 1*2=2, 2*3=6, 3*4=12, 4*5=20.

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