Question: 19. What does the following recurrence solve to? ( a_{1}=0, quad a_{n}=a_{n-1}+2(n-1) ) (a) ( frac{n(n+1)}{2} ) (b) ( frac{n(n-1)}{2} ) (c) ( n(n+1) )

19. What does the following recurrence solve to? \$ a_{1}=0, \\quad a_{n}=a_{n-1}+2(n-1) \$ (a) \$ \\frac{n(n+1)}{2} \$ (b) \$ \\frac{n(n-1)}{2} \$ (c) \$ n(n+1) \$ (d) \$ n(n-1) \$

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