Find a formula for the nth partial sum of the series and use it to find the series' sum. + . + 1.3 2.4 3.5 n(n + 2) +... 5n(3n + 4) 15 O A. S= S = 4n(n + 1) 4. 5n(3n + 5) 15 O B. Sn= S = 4 4(n + 1)(n + 2)' 5n(3n + 4). 15 OC. S= 4. 4n(n+2) 15 S= 4 5n(3n + 5) O D. S= 4n(n + 2)

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