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Find a closed form for sn=∑i=1n(5i−1). What is the first term of this sum? What is the nth term of the sum? If we write...

Find a closed form for sn=∑i=1n(5i−1). What is the first term of this sum? What is the nth term of the sum? If we write the sum both forwards and backwards and pair the terms vertically, what is the identical sum for each pair? Finally, give the closed form for sn=∑i=1n(5i−1). Find a closed form for sn=∑i=1n(8i−9). sn= Find a closed form for sn=∑i=1n(17−9i). sn= Find a closed form for sn=∑i=1n(−4−3i). sn=

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