Multiple choice general knowledge math & puzzles

Find the sequence of numbers? if n is the position of a number in a sequence, which number pattern is represented by the expression? n(n-2)

  1. -1, 0, 3, 7, 13, ...

  2. -1, 1, 3, 7, 15, ...

  3. -1, 0, 3, 8, 15, ...

  4. 1, 0, 3, 8, 15, ...

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

Using the expression n(n-2) for n = 1, 2, 3, 4, 5: 1(1-2)=-1; 2(2-2)=0; 3(3-2)=3; 4(4-2)=8; 5(5-2)=15. This matches the sequence -1, 0, 3, 8, 15. Other options fail at the fourth term (n=4).