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[" 10.If "(1)/(2)(1)/(sin(n+1)(n+2)(n+3)...

[" 10.If "(1)/(2)(1)/(sin(n+1)(n+2)(n+3))=(k)/(3)" ,then "k" is equal to: "],[[" (1) "(17)/(105)," (2) "(1)/(6)," (3) "(55)/(336)," (4) "(19)/(112)]]

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