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[" 13.If "(5+9+13+..." to "n" terms ")/(...

[" 13.If "(5+9+13+..." to "n" terms ")/(7+9+11+..." to "12" terms ")=(5)/(12)," then "n=],[[" (a) "12," (b) "18],[" (c) "10," (d) none of these "]]

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