Question: (b) Find 1-1 (k _ (k-1)3). (b) Show that 5%2 = n(n + 1)(2n + 1) k-1 (Hint: Use the formula -1 k-(n tl).)

(b) Find 1-1 (k" _ (k-1)3). (b) Show that 5%2 = n(n + 1)(2n + 1) k-1 (Hint: Use the formula -1 k-(n tl).)
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