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[" 9.If "n!,3times n!" and "(n+1)" ) Are...

[" 9.If "n!,3times n!" and "(n+1)" ) Are in GP,then "n!,5" ."],[[n" ,and "(n+1)!" are in "],[[" (a) "AP," (b) "6A," (c) "HP," (d) none of these "]]]

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