Express the sum W k=1 7k 5n in closed form. Express the sum n-1 k=1 3k...

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Express the sum W k=1 7k 5n in closed form. Express the sum n-1 k=1 3k 5n NOTE: Enter the exact answer. in closed form. Express the sum () k=1 NOTE: Enter the exact answer. in closed form. Express the sum W k=1 7k 5n in closed form. Express the sum n-1 k=1 3k 5n NOTE: Enter the exact answer. in closed form. Express the sum () k=1 NOTE: Enter the exact answer. in closed form.