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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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